My mom is a bully and a bad example for me, what should I do?

My mom makes me feel like a child and that I have no voice about anything. We fight about the littlest things and I cry out of frustration. She always thinks she is right, and when i prove to her that she's wrong, she goes on a different subject and never apologizes. We always end up in the same place in the end, which is her yelling at me and telling me how ungrateful i am and how she raised me on her own. That she should run away or send us back to our country and basically just to leave us to fend for ourselves. I feel hopeless and that im the adult because i try to reason with her but all she does is tell me to shut up or she'll smack me in the face.She's done it before when i was young so i dont take any chances. And the worst part is, she acts like nothing happened the next day and we never get anywhere. I try to tell her that im still angry about the fight but then she threatens me again. So i never bring it up and i pretend like everything is ok. I can't be near her anymore i've done this too long and my older brother fights with her too, but she never hits him and he can always get away by sleeping over his friends house. I feel like im trapped please help me im only 16