The greatest sports players are those that can help their team rise above their own inadequacies and win regardless of how the other team plays. Michael Jordan is THE example for this as any team he played with was suddenly THAT much better. Not because he was great (even though he was) but because he helped his team mates play great.
Maybe your team mates are bad... maybe you're just not supporting them enough? Maybe you need to learn more about how to lead and control the map? I understand it's very, VERY hard to help a guy who's going 1/10 in laning... but did your team do a 5v1 gank on his laner to shut him down? Did you all buy pink wards so your jungler wasn't picked off by shaco and trynd for the fourth time?
The only player you can control is yourself. When people see you doing well and making the right calls, they follow you and support you. When you're just another player trying hard not to feed... don't expect the team to carry you.