I need help

yes but the opposite i wanna kill my mom. when i'm hurt she tells me I live or you'll be fine.She watched me take a shower she a 60 year old woman I am a 14 year old female she watched me undress i'm also adopted.She's told me that she only adopting me for money and that if I go to a new house it will be worse than her house.She also sexualizes me.When i told the therapist she said maybe "she wanted to make sure your clean" my underwear has been disappearing and me and mom are the only people who live in the house.She convinces everyone that i'm the bad person and that she just trying to help me when she's not she also told her son to beat/slap the shit out of me.I'm to scared to go to the police because ill just be sent back to the house and if I am it will get worse. she gets mad over the smallest things she takes away things that I love to do and say it your fault your a evil kid your going to hell and sometimes she right in my head.I don't know what to do please help i tried burning down the house but i changed my mine when i was 12. Edit: i just took a shower and told me to retake the shower i told her that's nasty she said relax were all female in this house and she she told me why do you have your door open when your brother here as if i want him in my room to see me naked i had it open because i'm scared of the dark. my mom wont let me turn the light on.She bust in my room saying why are you naked when my door was clearly locked I told her I had no more underwear and the underwear I was wearing was to tight she said if i come in here again and see you naked your in trouble. She will also always say look how big your butt is or your growing out of those pants arent you or say big booty.