need help.

so how do I carry a game when every single other person on my team ALWAYS feeds. prime example: i'm mid lane 2 games ago and i go 6/0 i'm beyond fed I tell me team just play safe and i'll carry, what do they do? every single other lane and the jungler feeds the living hell out of the other team and they end up winning in 25 minutes. I'm gettign teams like this an obnoxiously large amount of the time... yes its true that if i'm considering my self good or better than my elo than theres only a 40% chance someone is bad, a 10% chance the entire team blows. But 12/15 of my last ranked games? come on now. I've tried getting a duo que but they never stay for more than a couple games.

However when i get a decent or good team i always win.