Your first year of college is a hugely transformative year. You move to a new place, you learn new things, and you make new friends, all of which will help to shape who you are as a person in the future. Here’s a list of some people you’ll almost certainly encounter.

1. The One Who Never Misses A Party

Yeah, you know that most college kids like to squeeze in a little fun between their studies, and most people go out Thursday, Friday and Saturday nights. What you don’t know is that there’s usually one borderline-psychopathic person in your group of friends who will pop off. Every. Single. Night. She's always decked out in theme, you'll never catch her in bed before 2 a.m., and she's never had FOMO. She’s crazy, but she’s also crazy fun. She's the last one at the bar...on Monday night. Isn't she too tired to go out again? Does she even do her homework? And the greatest mystery of them all: how is she still so skinny? She’ll take you on the ride of your life if you let her; but be warned: not everyone is built to function on a diet of high-caliber fun and midnight chicken fingers, so pace yourself accordingly.

2. The One Who Gets Straight A's

Is it even possible to maintain a 3.9 cumulative GPA during your freshman year, even though you’re also a varsity athlete, sorority sister, club member and student government officer? This friend will prove to you that it is possible, and she even makes it look easy. You want to hate her for being so good at everything, but instead, you’re honestly just impressed. You should know exactly which one of your friends is this person, but if you aren’t picturing someone yet, she’s the one you’re jealous of because your parents can’t stop gushing about her to your relatives.

3. The One Who Probably Shouldn't Get Straight A's But Somehow Does Anyway

He made President’s List, but he goes out every night. He’s at every party, he’s always asking what you’re up to, and he’s always down to chill. It baffles you how he can have a world-class social life and straight A’s, because nobody has ever seen him open a book, and he couldn’t find his way to the library with a map. Everyone wants to be this person. Advice: admire him and enjoy the mystery of it all, but don’t assume that you can emulate him. Only you know what you need to do to be successful, and for most of us, that involves at least the occasional study break.

Note: Similar advice applies to the friend who eats nothing but buffalo wings and milkshakes and has never seen the gym, but thinks the “Freshman 15” is the number of Krispy Kreme donuts you’re supposed to eat on a Sunday morning.

4. The One Who's Unrealistically Fit

She exercises. A lot. Like, a lot. You’re in class, she’s on a run. You’re doing homework, she’s in the gym. You’re in bed, she’s doing abs. Does she ever stop burning calories? You tried to work out with her, and you even did for a while. But then real life got in the way, and now you haven’t been to the fitness center in two months, but she still hasn’t taken advantage of rest day. You could sharpen a knife on her 8-pack. You’d like to hate her for it, but it’s what she loves. Just eat your ice cream and cheer her on.

5. The One Who Always Disappears

Have you ever seen this friend at a party? Probably not. You know why? He runs away. If you’re looking for him, the last person to see him left an hour ago, and he’s been MIA ever since. You probably went away with him on spring break in Punta Cana, didn’t see him for five days, and ran into him again on the flight home. Pro tip: try tying a balloon to his wrist so you don’t lose him. And don’t stress too much, because he always comes back; and there’s always a fantastic story to enjoy the next morning.

6. The One You Date

Remember high school, when you could only see your boy toy in between periods, at the cafeteria, and on weekends (if his parents let him borrow the car)? Well, those days are long gone. Welcome to college, where you can conceivably spend (almost) every minute of every day with the guy who makes your heart beat fast.

He’s the perfect addition to your crazy, weird group of friends, and at the end of a long day, he’s always there to take care of you/let you vent/watch New Girl with you/feed you ice cream. He’s probably the wallpaper on your phone, because you’re slightly obsessed with him, and you want everyone to know it. It’s amazing. It’s intoxicating. It’s more addictive than crystal meth. And to other people, it's sickening. But try to remember to make it to class, call your parents, and see your other friends enough that they don’t forget what you look like.

7. The One Who's In Your Sorority

She’s your SIIISSSSTTTTEEEERRRR <3333333. You can always go to her to talk sh*t about literally anything, because you already know it goes straight to the grave. She’s the only one who responds to your late-night calls, and she was already thinking she wanted ice cream when you asked. Sure, she can be a big, crazy bundle of girl-energy sometimes, but that’s what sisters are for, and you love them no matter what. All 200+ of them. And it’s not just for four years; it’s ~for life~.

8. The One You Live With

YOUR DAY ONE. I REPEAT: YOUR DAY ONE. You live together, so you’re going to get on each other’s nerves once in a while. But don’t let that get in the way of your friendship! She is the person you’re going to explore campus with, hit your first frat party with, and talk to for hours (weeks) about your first college crush. She'll probably even hold your hair once or twice. You will stay up ridiculously late with her, spill your guts to her, and eat some truly ill-advised late-night snacks with her. You will never forget her, and if she can put up with you for a whole year, she’s a keeper. When you’re a grandmother, you’ll literally be telling your grandkids about all the crazy adventures you went on together. So get on each other’s nerves as much as you want, but she’s not going anywhere, and neither are you.

9. The One Who's A World-Class Frat Star

You know who I’m talking about. He’s the life of very party. He wears ugly three-piece suits to formal. He’s never not wearing letters (pretty sure he's wearing Greek boxers under his three piece suit at formal). He missed class last week to sit shirtless in the dunk tank for his philanthropy. And he’s probably been featured on “Barstool Sports” or “Total Frat Move” this semester. You won’t catch him in the gym, because he’s been working on his dad bod since his junior year of high school, and he’s proud of it. Everyone knows his name for one reason or another, and he’s proud of that, too. He’s probably social chair, and he’s definitely hooked up with all your friends. What happens in the frat house, most definitely stays in the frat house.

10. The One With A Long-Distance Girlfriend

He’s been in love with his current girlfriend since he was in Pampers, and a few hundred (or thousand) miles hasn’t changed a thing. He’s not trying to impress anyone, so he wears pj’s to class every day, and he goes to parties... wait. Why does he even go out anymore? Isn't the whole point just to land girls? I guess he just goes out for... fun? (Guys, you can take a minute to process this – we’ll wait for you to catch up). You can always talk to him about boy drama, because he has the perfectly unbiased perspective of a boy who is not in the game. Most of the girls on campus have huge crushes on him, but all they can do is admire him from afar. He’s the unintentional heartbreaker. Ladies, watch out.

11. The One Who's Basically Everybody's Mom

She's probably done your laundry, made you food, taken you to the health center or forced you to do your homework at least one time this year. She always knows what's best for you, even when you don't. She's unusually good at soothing you during your worst hangovers, boy troubles and friend drama, and she'll ask for nothing in return. Maybe even send her some flowers on Mother's Day, just so she knows how much you appreciate her (especially when you're so far away from your actual mom).