Don't worry! I was in the same position when I started first year.
I joined SOCS during Welcome Week and went to every single event I could. Not only did I have a lot of fun, but I also met a lot of people. The friends I made during Welcome Week became my best friends; they happened to be in the same program so we had the same classes and got to spend more time together. Even the acquaintances I made I am still in contact with. I remember the first day of classes walking around campus and saying hello to nearly every other person. It was a great feeling!
I do know some commuters who, two years later, still have not made any friends. But they're to blame...they stay at home and only come to school for class. They didn't bother going to Welcome Week or other social opportunities.
Be open-minded and friendly! Friendships blossom from the most unexpected places.