I suggest finding a group of people with similar interests, because you'll be more likely to feel more comfortable around them. For instance, if you're into anime, and your campus has an anime club, try attending the meetings. Build your confidence up from there. Once you feel completely comfortable around these people (or at least as close as you think you're going to get), start being social with people a little further from your comfort zone, like classmates and other people in your residence hall.