Popping your gum

You blew bubbles as a kid, but as an adult, you realize there must be a more sophisticated way of playing with your gum. This may not seem like an adult thing to many people, but I JUST NOW learned how to pop my gum and I'm 20 years old. It truly feels like a landmark of my adult-ness.

Having staple groceries

As a kid, you just ate whatever your parents bought for you, but now that you're an adult you get to choose the groceries you want. You begin to get the brands you like, your favorite flavors, and really only the food you actually enjoy eating. For example, I have certain staple foods, and one of them is Simply Jif Creamy Peanut Butter—it's low sugar, and high peanut butter taste. My parents still buy the regular Jif Creamy Peanut Butter, which now tastes like candy to me because it's SO sweet!

Cooking the right amount of noodles

I once had a woman tell me that if you touch your thumb to your pointer finger, that is how much spaghetti to cook for two people. But how much macaroni? Bowties? Shells? I definitely have not mastered this one.

Choosing the right size of Tupperware

I'm slowly but surely getting better at this one, but I definitely struggle with choosing the right size of Tupperware container. I always knowingly go larger than necessary (because I don't want to overfill the container), but I accidentally always go WAY larger than necessary (like... three times too large). Not sure how to learn this one.

Wearing sensible clothing

You don't wear the 4-inch heels on the night out, and you actually wear a jacket during the winter. It's not something you needed to be taught because you knew what to wear, you just chose not to. The final mark of adulthood is realizing that sensible clothing trumps style. Every. Time.