Rage and fury is all League causes me these days

This post is mostly because I need to let some steam off, but god DAMN this is infuriating to the point of causing one to almost quit. The matchmaking system is such a piece of garbage that I almost give up the games before they even begin. Constantly I get into matches with 2 guys that are more than 1 entire league below me, and when I check the enemy team they all have an average combination that makes each player decent. This happens so often I have lost count, my team usually consists of platinum players, with a few diamonds from time to time, but the enemy team has pure diamonds all across the board. I literally have to op.gg both teams just to see my odds of winning, and like 9/10 times it's possible to calculate when I will lose these games.

I try to stay positive and utilize the /mute function. I try to keep the fighting spirit together and give out tactics that are necessary to win. But no matter how much I try to win, some dumbass still gets caught and lose the entire game because of it. This is probably what bothers me the most, the fact that I can have perfect cs, be ten times stronger than the enemies, take down all the towers in my lane, but I STILL lose because of some condition I have absolutely no control over. That's how you make someone feel cheated of their victory, it was taken away by some guy who's like "lul I otp Ekko let me mid" and then goes 0/8/3 despite that you killed the enemy midlaner 3 times in the early game.

There's no possible way that anyone can contain their rage through all this. It's not being strong or determined, because I am damn determined to get a higher rank, it's called insanity. This is insanity; to go into a game, get a couple of teammates, lose because of said teammates being lower elo than the enemy team, and then you repeat the process over and over and over. It seems more like RNG than actual individual performance at this point.

I've played this game since season 1 and currently sitting on D5 (D1 in 3v3), I have witnessed all sorts of crazy metas from stacking black cleavers to going force of nature on Mordekaiser and innervating locket on udyr, but I still can't find an answer to this problem.

What do you guys do to counteract this problem? How to do minimize your chances of getting this problem, and is there nothing to be done about it besides picking hyper carries and almost breaking your legs trying to carry them to the finish line? I want to hear people's answers and I don't care what rank you are, I accept all comments and look at the constructive and negative aspects of them.