Bad Mom

So, i’m a minor, i want to keep this low profile but I’ve been abused for as long I remember, by my mother. My mom who i I suspect has bipolar or trauma herself would beat me up as a kid to let her anger out, i also was the weaker one for reasons. My older brother who is much stronger than i am, would get into arguments with my mom a lot. You can see where this is going, i live in a small area and there isn’t places to go. My mom and i don’t have a bad relationship it’s at times though where she will get bad temper and start cussing us out very badly and sometimes hitting. I don’t really know what to do and I am more accepting that I can’t do anything because of my age. I hope other people who may be in some situation like mine, can tell me something or advice.