The first piece of advice that I received in regards to growing up was that I should own up to my faults and my mistakes and take responsibility for them. So often it seems as if we can blame our mistakes on human errors like spacing out/not paying attention/senioritis, etc... I hate to be the bearer of bad news, but employers don't care what your excuse for not getting your work done in time is. There are other people ready to claim your job the second you decide to slack off, so make it your mission to be responsible for yourself.
That brings me to my next point: if you want to be noticed, be confident and don't hold your opinions back. Despite what you see on Netflix and tv about bosses who take charge of a meeting to the point that they're only asking for their employees' opinions to their idea, that's the furthest from the truth! (That's also Hollywood, for you) Voice your thoughts and contribute your ideas! Your boss hired you because they thought you were the right fit for the job, so keep proving them that they were right.
Don't be a stranger to your colleagues either! When you're done with your shift at work, you're definitely going to want to unwind and relax. Who best to get some R&R with than someone from work who just understands #TheStruggle?
Another bit of advice: setting up your own appointments—be it doctor, dentist, optometrist, etc—is crucial to adulting correctly. It's going to cost you quite a bit of money if you forget to go to your appointment, and so having that looming feeling is probably going to help you be responsible and actually go when you're supposed to!
Look, sometimes you need an adulter adult, and that's okay! Using a plunger for the first time can be difficult, and changing a tire can be a difficult concept to grasp at first too—it's good to know, and hopefully you won't have to do it by yourself often—, but hey, it never hurts to ask for a little assistance.
There will be days when you wish that you could be that same carefree kid/teen/young adult that you were years ago with minimal responsibilities and a world full of opportunities, but the world is still full of the aforementioned! On the bright side, you don't have to purchase anymore outrageously priced textbooks, you have no curfew, and if you plan it right, you can travel anywhere your heart desires. And if you're ever feeling lost or lonely, I hope that you find it more comforting to know that there is a whole generation of people like you who are experiencing the same struggles of adulting as you are. You are not alone, and we're all in this together.
