PSA: Your teammates are not the reason you suck.

Your jungler is not at fault for not being able to take dragon when you've fed the enemy bot lane 7 kills in six minutes and lost your tower. Your support is not at fault for you repeatedly getting annihilated in team fights because you always front line as ADC. Your laners are not at fault for you not warding your own jungle entrances and easily getting counter-jungled. Your midlaner or jungler is not at fault for you getting ganked because you are constantly overextended in top lane. Your ADC is not at fault for leaving you to die when you get caught out trying to ward or roam.

There's this tendency for players to look for somebody to blame, especially when they are playing badly themselves. "Oh no, I'm 0-5 in top lane! Noob jungler doesn't gank! Meanwhile, enemy jungler ganked three times already!" Never mind of course that you are constantly over-extended and thus get ganked by the enemy jungler, or you trade with your abilities on cooldown, or you fight in giant enemy minion waves, or you flashed under tower greeding for a kill, etc.

Sure, you get the games where your teammates are feeding the ever-loving shit out of the enemy team, while you are playing really well. I don't believe that every game is winnable. But it's just as likely that the enemy team gets those players. And with enough games, it becomes a matter of improving enough as a player that you can carry more games like that than you could before.

There's exactly ONE thing in common in 100% of the games you lose, and that thing is YOU.