If winning is the only thing that can make League a fun experience you need to reassess why you play the game. Obviously the game can be frustrating at times, but at the end of the day you just have to chill. It's a team based game but you have more influence over your team than you think. Very rarely is anything stopping you from being a leader and pushing your team to make the right choices.
That is the problem. Yes, you can influence the performance of your team to a certain point but you can only push a herd of monkey so far. I dont mind losing, but when you have limited free time, it is extremely frustrating to get a match where any of these happen:
a)afk whether from the start or mid game
b)meta sheep who play LoL the same way every time, do not adapt to the situation.
This one includes people that stay in their lane the entire match, build what their guide says no matter what the other team comp is etc etc etc
c)people that do not communicate or do not respond to efforts of the team communicating with them. If I ping you 3 times when theres a mia, dont freaking push your lane because you are getting ganked. If I ping you when I'm chasing someone to your lane, come because I only pinged after seeing you are not engaging your lane and we can get a kill
d)people that play this like it was call of duty. 1v3? fuck it they are superman they will get it for sure, 8th time is the charm.
e)people that do not understand that the goal of the game is to destroy turrets and eventually the nexus.
f)get matched against a premade that is on vent and experience playing with each other and in your team you have a semi decent player that q'd with his newbie friend to teach him the game.
I could go on and on. And we all know these happen far too often in Solo Q to be worth your time. There are far better options to spend your free time on, videogame or not. With every match you are playing a probability game, betting your free time that your ability to carry is greater than any of the previous things put together. Again, I feel like it is not worth it unless you have other people to Q with