Plssss help need adviccee?

My rents are always fighting anout money and obnoxious things. They always put me in the middle of it. Not my brother but me. Theyre like riley go do this a d go do that. Its sad because they hit eachother well at leasts my mom does when dad does nithing wrong. And i gi ask mom yd u hit dad then shell smak me and drag me by the arm and throw me into my room wich is also right by the stairs and i always get thrown down them . And all of this i thi k i am suffering depressio. Becase im havibg suicidal threats and "cutting". Only my good frienf knows about my depression an my parents fighti g making it worse. I dont know what to do