How do I stay calm after losing a game I didn't deserve to lose

It makes no sense . Riot expects u to handle uncarriable games but at the same time says if you're good you will carry every game. I KNOW I'm better than these MORONS u place me with. I know I can do well both in lane and out of lane. I DONT 3v1 a graves Lisandra and malphite. Come out on top with most cs most gold and second most damage ONLY to lose because of my incapable jungler who has 0 ganks or pressure for 20 minutes . 0-0-0 plat 2 gragas who missed every ulti, every smite is considered a decent player . 17-7-11 riven who has to 3v1 top and is still number 1 in the game is considered toxic because she was angry her mid and jungler were feeding and playing bad . This game has no consistency when it comes to competitive integrity