Do not be afraid to try new things, like joining a club or a rec team, or even just picking up that hobby that's always interest you that you may have never thought about attempting. Don't think about the person you were in high school, be the person you want to be. Don't worry about making friends, you will make friends. Your first semester is will be like one large welcome party, everyone will want to be your friend, and you the will want to be everyone else's friend no matter who they are, no one cares who you are, if you're in college your cool. If you're living in your college's dorm, leave your door open when your there, probably the easiest way to meet people on your floor, heck my dorm floor got to the point where we'd just leave our doors open when we weren't there. We became like one large family. Those friendships also became some of the strongest friendships I made throughout my entire college experience. Lower level classes were probably the hardest classes in all of college, I shit you not. College is about having fun.