User blog comment:TeamS5/Help!/@comment-4593717-20130711213934

Everyone who has this kind of complaint always claims that they're doing everythin they can to try to make their team do better, but they're never telling the truth. If you're losing games with a score like that 85% of the time, it means that you aren't actually performing as well as you say you are. You CAN carry your team with the right attitude and strrong gameplay. I suggest you watch some of your replays (get LoL Replay if you must) and try to see what you should have done in all situations to try and learn. I'm not saying that all games are winnable, but if you perform on a high level (higher than is expected for your MMR or ELO) then you can win 70%-80% of your games. Just keep at it and eventually you will find the way to further yourself. If you need other sources I suggest gregidot and gbay99 on Youtube. They're quite helpful in improving you League of Legends performance (and gregidot is also hilarious at the same time).

Links: http://www.youtube.com/user/gbay99 http://www.youtube.com/user/gregidot

I especially recommend (even though it's about ranked, it still applies to your situation): http://www.youtube.com/watch?v=AJ4vPCY11eM http://www.youtube.com/watch?v=5MTO2a7ZFcc