The greatest conflicts are not between two people but between one person and her/himself."
Try to remember that each human being is trying for the same thing you are-to be happy and at ease. Don’t demonize those you don’t like.
“Peace starts within each of us. When we have inner peace, we can be at peace with those around us.” Dalai Lama
If you are having difficulty, try to address it immediately. Don’t tell yourself it is “no big deal.” Talk with the person you have an issue with. If you are unsuccessful in resolving the problem, you can talk to your RA or the residence staff.
This site has tips for living with roommates.