As a young child all you think about is being a "grown up" and get a cool job. What in the world were we thinking? I am now 19, going to school and have three different jobs. Growing up isn't what it's made out to be when you're 6.
While we may be forced to get a job and have responsibilities (ew) we don't have to necessarily stop being a kid. Kids are so carefree, they don't stop and think about what everyone else thinks of them. Don't lose that. Dance however you want, no matter how many people are watching. Wear whatever you want, act however you want, talk however you want, don't let anyone tell you how to live your life.
Always have fun. Do what makes you happy, go out drinking, stay in and color do whatever it is that's fun to you. Go out with your friends or stay home with your family.
Bottom line, don't let anyone tell you what to do. Be a kid, be young, just because you are halfway through college doesn't mean you have to suddenly know what you're doing with your life. You don't have to know what major you want or what school you want to attend. Everything can be changed, nothing is permanent.
Do what you want and be what you want.