How do I carry feeders?

This is something that has been bugging me since Season 4. I main Garen Top and I do pretty well every game, even when I'm hard countered. But I can't seem to find a way to carry a team that falls behind by a lot. Granted, it's not their fault and many times the enemy is just that good. The reality is everybody feeds. I understand this, but I really need to know how to win these games for my team. It always seem like when I'm there, the enemy dies, but I can't be there all the time. I need to farm and level up.
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