Get out more!
Don't try to appease your roommate or not feel left out at the risk of getting a write up.
I'm a very outgoing person, even so, when I first went to college and was living in the dorms I had a slow start. If you're comfortable striking up conversations with strangers, try this: The next time you're in the dining hall, look around. Maybe there will be people that you gravitate towards. Like a person who dresses in a similar style, or a person who is wearing a tshirt of a band you like [or a sports team], if you overhear someone talking about something you like and know about, etc You can just keep it real and say "Hi! I don't know many people here yet. I heard you talking about/I noticed your shirt [or whatever fits], do you mind if I sit with you?". It sounds corny, I know, and you don't have to say exactly that. If you're good at reading people at a basic level, you'll be able to tell who is approachable and who is not. That technique worked WONDERS for me. I made friends with all sorts of people and I had a great freshman year and a great time in the dorms.
Also, going onto campus and mingling around at events or signing up for activities and campus groups really helps too. There's always something fun going on!
Best of luck. It will be a great experience if you make it so!