Why does my mother annoy me so much.

I can't say she has not been a good mother, but she is very annoying. I don't know if it's just me but i remember when my brother lived with us before he moved out he use to get annoyed by her to. She just does things little things that piss me off. For example she knows i hate when people cut me off mid sentence and she does it anyways. She is very controlling over everything i do down to the way i eat. I could get 100s in exams, quizzes, etc and she wouldn't have anything to say. I have had countless girlfriends that she has made run off on me because of her behavior. As of late i have been starting to just dread being near her it's always something with her. I don't do this right, i forgot to do this, and it's not like i do something incorrect 24/7 on rare instances i may forget to do something like not turn on the fan she she blows up. Is it wrong for me to want to move out leave her on her own so she can see how much i actually help her out in. She pretty much makes me do everything, I'm not a lazy person either i go to the gym, i go to college, i go out with my friends, i study for all my exams. So i really don't understand what she wants from me i don't have patience anymore i just walk away. It's the same story everyday i come tired from school go to the gym she comes home and has a attitude every single day of the week.