I'm tired of it.

I know it's not always my team mates fault for my loss but I'm seriously tired of this crap. I always help other lanes even if I'm top, I always gank whenever my team needs help, I tell my team to play PASSIVE but they end up dying 5 times top before I even have a possible chance to help them, I 95% of the time win my lane but I still can't carry my team mates. So I'm going to ask..

How do I get better? Or am I just getting unlucky.. I know I'm not amazing but it's so depressing seeing my team mates 4/9, 0/11, 9/9, 2/9 .. While my score is 20/8 or usually decent at least. I have SOME bad games, not a lot. But sometimes it feels so impossible to carry, how do I get good enough to carry AT LEAST 3 people sometimes, I have no clue.

Just asking for advice since It's really hitting me hard. :l