"Keep this in mind. I will repeat later because I know you league of legends players like to change subject alot"
Thanks for giving us credit, man I really sympathi.... Yasuo has too much mobility...... Yeah no, you've lost whatever sympathy I might have had. Now it's time to dissect your little post.
"He was trolling" "He was trolling" again... Yeah we get it, you think he's trolling. Then you proceed to ask the enemy (not exactly your friend) if he is indeed seeing what you are seeing. He offers no sympathy as he's just got a free lane and possibly a free win, yet you proceed to flip your lid. That was mistake number 1 and 2 in all honesty.
"This troll teemo turned my entire team against me. And then I was perma banned for it?" You also didn't get perma-banned from one offence unless you went all out. I expect nothing but suicide challenges and racial slurs out the butt no doubt right? Hahaha no... You knew very well that your ban was coming yet you refused to change how you compose yourself in games. Sounds like you deserved it man, not to be rude but yea, I can't put it any nicer way. (More or less mistakes 3-5 here)
But hey, let's just take a look at the whole picture here cause why not. You're likely where you're supposed to be ranked wise coming in at a 49% winrate over 400ish games, so getting crazy upset about one loss is really childish and unnecessary. You are still in the silver elo range so trolls/unskilled players are all over the place, but getting incredibly upset at them is pretty much the worst thing you can do. This is, if you want to win... or climb.
So it sounds like you got two or possibly three options here. Hope to god that riot will accept a ban repeal and either clean your act up and start fresh so to speak. You could also go make a new account and try again, if you show some more respect to others not only will you climb easier, but you also won't get so messed up if you lose a game to a troll or a feeder. Or finally you could just leave league. You could move on to COD, WOW, Smite, Dota, etc, etc. But keep one thing in mind. Outside of COD they have much more serious punishments and much less tolerant banning systems.
Whatever you decide to do is up to you, but I do wish you the best. It's obvious you have some little demons to work out, but once you do everything will be easier and more enjoyable. Good luck mate.