Why does my boyfriend hate me?

I asked this question and this is because she has ; almost broken my wrists (3 times), winded me, punched me in the stomach, pinched me with her nails, pulled my hair so hard it felt like she was pulling all of it out, bent my fingers back and slapped me continuously. These are only 1/8 of the things she has done to me. There is 18 months between us. She is 12 and I am almost 11. Also she has said to me I was an accident when I was born and I wasn't meant to be born and she doesn't love me. She says lots of things to me and it makes me cry.

If she hates me I hate her too :'(