See if I’ve got this right. Your room-mate bugs you? Her little habits or idiosyncrasies annoy you?
I imagine then, that you are young and not used to living with strangers, other than your family.
This is something we all have to go through sooner or later. If you get married one day, you will need patience and tolerance for your partner’s idiosyncrasies. Some of your habits may bother her too.
Now having said that, if these habits are unreasonable such as not sharing cleaning duties, then you need to confront your room-mate about them. You don’t have to put up with an untidy kitchen for example, her not washing pots and pans. Another annoyance might be her bringing noisy friends over or her practising a musical instrument. I can’t stand someone putting their feet up on a coffee table whilst watching TV but I know some people it doesn’t bother them.
Otherwise, can you afford to live alone? If more people could afford to live alone, I’m sure they would. Good luck

You might be over-analysing, blaming yourself too much. Oversensitivity?
Then lighten up, have a few beers, pretend to be an unphased extrovert. That worked for me to some extent. Until I realised I was drinking too much, becoming an alcoholic. 🙂

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!).