My mom abused me growing up just the standerd bulling and smacking me around kicking me telling me its my fault her husband whipped me chocked me and left bruises

Ive been living with my dad since freashamn year im now a junior and i do not want to see her

She bipolar and will make things worse

What can i tell my dad shes been using him my entire life ive been trying to get him to stand up for himself but i dont know what to say anymore i do not want to see this woman