Help!!!! My dad is torturing me.!!?

Okay....I am a twelve year old boy. I have great friends. Every one in my family is nice to me except my dad. He keeps on torturing me. He is not a drunken guy who drinks alot of achohol. He is very smart... But he always yell at our family.. especially me. He always takes his belt and beat me till I bleed. I'm afirad. Please help!!!