I’m stuck I’m my own house

I was adopted when I was little and the family I live with treats me like hell. I can’t keep doing it. I’m called nasty names like slut and whore she took my phone for 2 years so I couldn’t talk to anyone she slapped my sister and tells us we are lazy and that we make her want kill herself. She will go in our rooms and take our things and put them in the trash. She’s crazy. I can’t stay there anymore. I live in Alabama how old do I have to be to leave? I’m 17 now.