I think I want to drop out

My roommate makes my life such a living hell that I'm thinking of dropping out.

I dread coming back to school. My room is always a mess from her. I came home recently after being sick to find the trash bin piled up higher than my waist, and her garbage mixed in with my belongings (eg under my rug and desk, and in my bed). I also haven't been able to sleep solidly through the night for a while because she doesn't follow the roommate agreement and continues making noise after the agreed time. She also doesn't chain the door after including it in the roommate agreement, and our suitemates often come into our room without knocking. They came in around two a.m. the other morning and went through the room, thinking both my roommate and I were asleep.

I don't feel safe bringing my RA in to mediate because my roommate is always saying nasty things about people behind their back, and I've already been on the receiving end of that before from her. She's even said something mean about me in front of me before. I asked my RA to move out and mentioned her insulting me, but there's no space for me anywhere else. I don't know what to do. It seems like my only option left is to drop out.