What should i do about my dad?

I'm 13.My parents took the lock off my door(they don't trust me).But they always knock and wait for me to say come in.But I had took a shower and didn't take any clothes in the bathroom.So I went in my room to put my clothes on.And my dad just barged in.So I was like WTF DAD. So got mad and told me to bend over the bed.Then he spanked me.