You don't need to have a roommate to be a sociable person.
Roommates are terrific people to be with if they share the same tastes and ideas. In general, if they're considerate that's already a step up from everyone else. I'm all for good roommates, but the stories about bad ones are far more widespread, and thus give roommates in general a bad impression.
The only thing I'll say though, if you plan on living in a dorm:
- Do you like quiet hours?
- Do you like privacy?
- Do you like being happy?
- Do you like sleeping?
- Do you like not being a cranky-ass dickhole all the time?
- Do you like clean bathrooms?
- Do you like good food?
If you answered yes to any of the above, don't fucking get in a dorm. The main idea behind this is because its not roommates you'll be contending with, but instead your hallmates, or basically the people that live on the same floor as you. Unlike your possible future roommate(s), they don't give a flying fuck what you think, and they don't give a flying fuck if you call the cops/authorities on them - in general, if you're going to go against anything that's happening in the common area or the hallway between rooms, you're basically battling against a hivemind that's almost everyone but you.
In this day and age, everyone in university likes to blare their music at 500% volume with maximum bass at all hours of the day/night, run around yelling "nigger", "fuck", "asshole", or some semblance of a combination of the three, like to bang on walls, never study, and turn the bathroom into a Toilet Paper Tornado.
Being stupid is never normal, but in dorms it is.