Come on Arphaxad, is just a game. Take it easy.
I was at this point, where you are right now, many times. Yet I'm still here, some things you can't change, this is a simple game with many bad mechanics and gamebreaking things like friendly bug, which is still around for years, or tanking, upselling... all of that.
You will never have a fair and perfect game, which is an online game and is free on top.
And you know whats funny? @Superdunk is here to defend the game. He was at this point also many many times with his trolls in CL finals. And he is also still around.
Sure if you think, that this game is only wasting your time, you should quit.
But for me the positive moments I have with this game, and especially with the friends I know from this game, still mostly outweighs the negative aspects. The times were I tried very hard though, surely over. This game is in no way competitive imo. If it is important to you to show off your skills and be better than other managers, this is 100% the wrong game.