Living with a roommate is obviously different from living with your family, where you knew each other so well you didn't have to think twice about it. Then, suddenly, you come to college and are expected to share a hundred square feet of space with a total stranger, who may have a totally different background, lifestyle, and personal habits. It can sound a little intimidating, but in the back of your mind you know the experience will endow you with great things like "interpersonal skills" that will help you out long after you've turned in your key to ResLife.
You and your roommate can be very different and still have a successful roommate relationship. It is important that your expectations are realistic or you may be disappointed. Don't expect your roommate to be just like you or your friends from home. It's normal to encounter some problems. After all, it's unrealistic to expect 2 strangers who share a small space to get along all the time. Basically, getting along with a roommate involves 3 Cs: courtesy, communication, and compromise.