My sister has a similar thing. Very bothered by other people. She reminds herself: ‘observe, not absorb’. How many hours your room-mate is studying you bothers because… she is studying less than you? she is studying more than you? In other words, is it because you are *comparing* yourself with her that you get annoyed? Everyone is different. Learn to celebrate that difference. Train yourself to focus on the things that you appreciate, rather than the things that you don’t. Catch yourself in the habit of being annoyed (because that is all it is, a habit) and consciously reach for something to appreciate instead, however small. Do this every time, and you will start finding her easier to live with (and you’ll be easier to live with too!).