Verbally abusive mother help?

My mom has always verbally abused me. she calls me fat, stupid, nerd, dumb, gay, and retarded. She talks negatively about me behind my back and even to total strangers. This has happened to me all my life. It is getting to me. I have no confidence in talking to girls at my highschool because all I see or hear are the things my mother said to me. I do very well in school, but recently she said I am worthless and stupid. It hurt me so bad that I barely want to do school work anymore. I am tempted to resort to drugs to find an escape. As a child I rarely saw my father because he worked nights. Now that he is at marine, I only see him a few months each year. Anyway, my mom also gives poor instructions. She is not born in this country, she was born in the Philipines so her English is simply awful at times. She doesn't always finish her sentences, and when I ask her a question, she slaps me in the face, and says I am stupid. My grandmother died, and she was simply awful to her on her final days. My grandmother would ask for something, and my mom would yell at her and even curse her. Since she died, I have always felt it was my mom who killed her. My mom felt so bad, and is superstitious about everything now, to the point where it is annoying. We have these family prayer seeions, and naturally I am soft spoken. One night she said I wasn't praying, I told her I was, then she took the dog's chew toy and through it at my face. When we moved into a new house, we had a lot to lift. there was this sofa we were moving out of the moving van, then her side fell jamming my finger between two wooden pieces. It hurt A LOT. I told her to help, and she did, then she said it was my fault for not paying attention. When we are with the Filipino youth organization, she embarases the hell out of me. She acts like she is cool and as if she is a teenager. She teases guys that they wear skinny jeans saying it's girly, (I put up with it a lot to cuz I wear them as well), and even openly talks about my personal life with them. Today, she asked me how to upload to Facebook, then as I finished, she screamed saying "ARE YOU STUPID, WHY ARE YOU DOING THAT". I tried to explain why it was necessaty to reload the page, then she hit my arm and said she knew better. I got pissed and said, if you know better why did you ask for my ******* help. She got mad and said "I am your mom. you piece of shet, don't ever talk to me that way." then she walked away from the scene. I have the urge to beat her. I want to et it into her head that I am not someone she can just push around and ignore. She knows NOTHING about me, and thinks I only have one teacher at school, and I am in highschool. She still asks when my birthday is, and what grade I am in high school. I want to kill that *****. It is hard because I don't want to be like her as a parent, and I don't want to have all those awful memories with me forever. what do I do? I am going to college soon, and I intened oto not answer her calls unless it is my dad. HELP ME.