How can I just grow up and be a normal 20 year old?

it sounds like ur hanging out with the wrong group of friends!! U are not alone! TRUST ME! i have several friends who are ur age and have never done ANYTHING. (They're not weird lol.. they're all really pretty annnnd normal) 10 yrs down the road U will be better off than them! I know how u feel because when i hangout with my "bad friends" they make me feel like a kid and immature etc. but ive learned to surround myself with good friends who i look up to. who i want to be like. they have such confidence! ur friends are beinng immature.. not you!! find some new friends.