Why do I hate my own father?

Probably because his actions bothers you or he does stuff you don't like. I grantee you your feeling is completely normal so don't feel bad about it. But remember whatever he did he is still your father. I don't know what is your situation exactly so I can't judge but I think you should try to understand why does he do that. Try talking to him and ask him why does he act the way he acts you will probably get an answer of what you want. Maybe alot of pressure is on him try to know his circumstances and I wish you get through this happily