At my college, if you're living on campus, you have to have roommates.
But every college is different.

I think the vast majority of people are this way though, picky about people they live with, whether they realize it or not. And you know what? My first roommate (a random stranger my school put me in a room with) suuuucked. She wasn't the worst because she was hardly around, but when she was she was awful. And you know what? That's a part of life and something you're going to have to deal with (most likely) at some point in your life. You learn a lot about yourself and other people having to live with them and even if they're your best friend you're going to have turmoil at some point.

I don't think you should be too worried about it, it'll be a good experience in the long run, even if it means getting a bad experience out of the way early.

As for the overall experience (for me thus far~): I've had extreme positives and negatives, definitely my highest highs and my lowest lows I've experienced in my life thus far.
College so far has REALLY been what you make of it. It's up to you and what you want to/make yourself do. My biggest advice is to do some things outside your comfort zone. Experience things. Don't do anything crazy, but make yourself grow. That doesn't mean you have to go binge drinking just to experience it or anything like that, but if you're nervous to go to a book club or a special lecture or WHATEVER, just go for it. Don't be afraid of change, unless you live the most sheltered, dull, lonely life I've got news for you: you're going to change. At some point in life, it's going to have to happen, might as well start now.