hey riot its awsome when i can main supp with 0 kills 0 deaths and 5000000 assist

So i main supp, i do good every game, well most games, so i get shit teammates that are fuckin dumb, so i lose. my score when i win... 0 kills 0 deaths and 50000000000 assist dont fuckin matter how good i do i only get 13-15 lp... when i lose score same minus 22 lp fuckin joke riot rank system is a fuckin joke.