My kitten bites me R E A L L Y hard?

it hurts so freaking much, i dont know what to do..i know that kittens like to play this way, but this is getting out of line..eat feels lika a cannibal is trying to eat me alive..and people probalby thinks that i cut myself caue of all the scars i have on my hands. Something must be done, i dont want him to act like this when he gets older.