I hate my mother/family.

Ever since I was little I been constantly abused mentally and physically by my so called "mother". I used to live at my grandma's house, it had two floors, I live in the upper one and my "mother" lived with my Stepfather and my two younger siblings in the lower one. My "mother" has always treated me horrible, 'cause apparently I ruined her life (she had me at 17-18), she treats my sister like a princess and my brother like a prince (still does).I barely saw her, she would go out till really late with her husband and sometimes took my brother and sister with them leaving me with my grandma. She used me as a maid (I was seven year old) to clean all the lower level of the house, and sometimes beat me up for doing something stupid or for fighting with my brothers( just me not my sis nor bro and she wouldn't hold back). At the age of 14 I decide that I'm not doing her chores/house work anymore, she beat me up everyday till she got tired. In junior High School I cut/slit my wrist, somebody told her, and she went to my room and told me that what had she done to have a ungrateful daughter, that she trying to be the best mother for her children and then she pulled the "I carried you in me for nine month" speech, after a while and outta the blue she asked me if I was lesbians..(idk) .
Around the age of 17, when I finally got in high school,we move to the new house, she force me to, and now shes trying to have a mother-daughter relationship...
I triad, I really did, but she usually beat me up or just insult me.
Again, I cut/slit my wrist, she didn't found out and sadly I couldn't end my life, I got Anorexic/Bulimic :::/ but I decided I was going to be on top of my class, and I was and also some friends helped me to eat more and not puke. I entered College and I was so happy 'cause it was two hours from my house, I lived alone, I changed completely, I was full of energy, happy , positive, etc until I had to go back I vacation. I got kicked out my house for a month :/ for telling her that I wasn't going to let my brother walk all over me and treat me like he wants and also for not cleaning the room, the only way I would go back was if I apologize and say I love you to her :/ you guys don't know how humiliating that was, but I needed to go back to College.
Finally I talk to mother (trying to have a heart to heart talk with her since she was acting unusually nice to me) I told her that my boyfriend doesn't get along that well with my brother but that he was trying to, she without letting me continue or explain went berserk calling me and my boyfriend ignorant's, and that she dislikes him and me even more then before and that she never like what I did nor how I was but that she had to suck it up. I can't really reason with her and I triad to talk to my stepfather to see if he could reason with her but the moment she walked in the room he went all alpha male (I don't know if it was so that he could look more manly), and then she went and butt in, talking sh*t that weren't even true, I told her that I was talking to "Dad" and not to her, and during all this time she was using her "don't make me kill you" tone(female alpha) and told me to cut the shit, I try to talk to "Dad" but she went in the middle preparing to hit me and "dad" moved her away, my final words towards HER were "you really don't know how reason out, do you?"