Please help my mom won't leave me alone and she treats me like crap?

Right now Im tired of having a mom in general...because I had to get stuck with one of the dumbest, laziest, people in the world to have to call my mother... She blames me for everything even for stuff that's not my fault... Like now she wants me to give her almost $80.00 because she lost her case to a cord that she bought...then she was on the phone and she was too lazy to type in these numbers for her phone and she made me do it...she lost the numbers and now she blames me for it...whenever I try to tell her about it Im wrong and I have "too much lip" she constantly criticizes me about me liking video games (I like them but I don't play them often) she says that my 5 year old sister is gonna be better than me and she wonders where she went wrong with me...(Im an honor roll student and I don't go anywhere) then on top of all that she won't leave me alone...she's always in my room and she sleeps in my bed for cryin out loud!!! Then she constantly talks about going to college with me this fall...I can't take this for too much longer what do I do?