instead of blaming everyone else why not look at what you can do to improve your own game play. Will you lose because the rest of your team is just worse than the other team yes that is typically what happens in a game where there is only 1 winner and 1 loser.
3 easy tips to improve your own and others in your game
-Don't flame stop getting mad about win losses because honestly it doesn't mean anything if you play the game to get better you WILL climb even if you win even if you carried the game take a step back maybe watch a replay and look at where YOU made a mistake not if someone else made a mistake and work on improving yourself. (obviously almost no one watches their own replays i know i don't but you can still typically reflect on what you could've done better. its not the number of mistakes you make vs the number of mistakes your teammates make. it's how you learn from the mistakes made in the game whether they are yours or your teammates.
-Don't play mechanically difficult champs or champs with a high skill cap 
based on your op.gg recently played games. mechanics distract you from whats going on in the rest of them game and typically the more difficult a champ is to play the more variance your games will be. Even if you can get a few kills on lee sin early game after a certain point it becomes EXTREMELY difficult to close out a game lee scales poorly and the window of opportunity gets smaller.
-Ping more ping smart don't ping to be a douche call out missing give you team as much information as you can without hindering your own play. if Mid is missing and you see that call it out. It's a team game and although yes ideally it would be great if everyone called this out 100% of the time but even in pro play they don't. Be friendly when giving out information "Careful X might be going top/mid/bot/red/blue/dragon" If you're truly better than your opponents you should be able to know exactly what they are going to do at least 50% of the time.
Also if you are the only player doing well your team will tend to center around you. You being the only fed player means you have to play even better than if the gold was split between the entire team. If all the enemy team has to do is kill you and then the rest of your team falls apart you need to prepare yourself for that and itemize against it even at worlds you saw AP carries going 
just because an item isn't build traditionally for a role you it could still be useful for you.
