My mom makes me feel like a slut?

im 15, ill be a sophmore and my mom makes me feel awful about myself. she treats me like ****. my dad died 2 yrs ago, and she is emotionally unstable. she had severe depression and anger issues, and im convinced she has bipolar as well.ive gone to private school my whole life and she has been talking bout allowing me to go to a public school close by that alot of my friends are going to for like ever, but 2nite she threatened to send me to a rlly strcit private school that i know i wouldnt do well in cuz its a hard skool. she thinks i am a or something when the truth is i have never gone farther then making out with a boy, ive only had one boyfriend, yet she randomly will bring up how she doesnt want me getting preggers and she never trusts me when i go out even just to hang with friends. my friends drink, but i hardly do and if i do i only have one beer and im very responsible, i dont do drugs or anything like that, and im not a slut. she also hates my hair cuz its long and rlly blonde, and she thinks gurls should have short dark hair. i used to have short dark hair but then i dyed it blonde and grew it out and i love it but she makes it quit apparent that she doesnt like it. she will say things like "dont u tihnk ut har looks to blonde" or "my god ur hair looks blonde" or "shouldnt u cut that?" she will also lecture me about how she thinks im anerexic. or how she doesnt like the clothes i wear, or that i cant handle myself, and i dont apreciate anything she deos for me. how can i deal with how much she puts me down?how can i convince her to not send me to the strict private skool. do u tihnk shes bluffing bout that?cuz the skool is rlly expensive while the public one is totally free and were def not rich. i just want to run away.