I never rage quit... And I rage quit

I was playing a game. I got super fed and every other lane was losing. I'm talking super fed. 15/1 fed. The entire rest of my team was terrible. The enemy team grouped up and went mid. I was mid. I got a triple kill and died. The remaining 2 members of their team pushed mid killed all of my team and took the inhibitor. I was furious. I had a thresh on my team who haven't made one pull all game. No Lantern sheilds, no nothing he was terrible. I couldn't stand it and I quit. I immediately realized that I would get banned or something from afk so I reloaded. I loaded back in the kindle of a team fight got a penta kill and won the game for my shitty ass team. Miracles do happen but I'm in gold why the hell do I get teams like this wtf.