I don't know if you would have a dorm roommate or live in apartment style housing...those are really different in terms of roommates. If you live in housing owned by the college, you can change roommates after a while (maybe after the semester, I don't really know). If you're in an apartment, it's up to you and your roommates to work out your problems. I recommend living in apartments that are just for students...I've found some like that and they are sort of prepared for problems. Say, if one of you decides to leave, you only pay your part of the rent...you don't worry about your roommates part.
I've only lived with someone short term. Every time I have it's been fun, but maybe that's because it's short term
I may have a roommate at college this fall. I'll certainly live in housing with other students. I have:
1. on a mission trip a whole bunch of us girls stayed in one big room of bunk beds and shared a communal bathroom. No one liked the bathroom deal, but it was fun all staying together. Keep in mind, we basically only slept in the same room but weren't together the rest of the day.
2. at a camp 3 of us stayed together in a room. Long term it would have been a nightmare (sharing a tiny bathroom & we had no room, plus we all had totally different personalities), but for the week or so we had a blast.
3. my parents moved out of our apartment and into a house, but we still had the apartment for about 3 weeks or so. Me and my friend stayed in the apartment that time and played house
Lots of fun. But I also got to see the kinds of problems that would arise. Some nights she wanted to stay out later than me and I woke up when she came in, that was annoying. We both cooked but just one of us did the dishes. Cleaning the house wasn't split equally. Stuff like that.