I feel like I've wasted my first two years of college?

I'm about to finish my sopre year of college, and after this I'm transferring to another university. I had to go state school to save money, and my entire graduating cl from high school came here as well, and so I just hung out with my best friend from high school. Every semester I tried to transfer, and spent practically all of my free time inside my dorm room because I was so scared of the partiers on my floor. Also it's really cold outside. I haven't gotten involved in anything because I can't make myself stick to an activity, and basically I've just spent two years wishing I was someplace else. I know that was the wrong thing to do now, but I was just so depressed and sad that I hadn't gotten the chance to go to a better school, like my brother, who loves college. Even worse, my incredibly mean sister transferred here this year. What can I do to liven up the last two months of this year? I'm not a partier, which practically everyone else is, and my floormates think I'm a freak because I don't talk to them and spend all my time in my room. Thanks.