Can I please just get consistent teams until gold?

Seriously, it feels like I'm being purposely matched with fucking morons. I go on a winning streak, get close to my gold promos (or even reach them) and then lose in absolute blowouts until S5... then repeat the process. I have over 4,000 games in silver despite being able to massively win lane every game, roam to other lanes, control objectives, maintain a 6:1 KDA up until recently, and do my job.

I know people just say to play a carry role and win. But, I highly doubt any of you can 1v5 a fed enemy team while you're only somewhat ahead. If you can, show me a video and prove it, and then I'll just accept the fact that I'm bad. I get frustrated in games easily because of the fact that I have 4,000+ games in silver thanks to morons I'm forced to rely on, and I don't play as well when I get upset. But when I'm coming out of lane 10/2 and bot lane has a combined 15 deaths... I just don't know what I can fucking do anyway.

So, why can't I get consistent teams? Why is my team ALWAYS the one that feeds their asses off? What can I do when I'm the only person on my team that isn't feeding, but the entire enemy team is fed to absurdity? Is there a champ that can reliably 1v5 a fed team? >.>