Hiya!
First off, I think it's awesome that you're reaching out for help/suggestions on how to improve your behavior.
How to not rage in games?
How to not be toxic in game (Not crazy stuff stuff like "Ok you know what you suck i am done with you"
I grouped these together, since they both kind of fall under the same category.
I'll admit, there are times where I become extremely frustrated, both at myself, or not so great plays in a team fight. I do two things that allow me to vent my frustration, but also doesn't affect my teammates.
- I'll vent in Skype with my friends, or if I'm solo, I'll just say things out loud.
- I'll type what I was going to say, and just delete it. Be careful with this one - it's all about self control when it comes to not hitting Enter.
Learning to let things go is a big part of learning to play better. Your support just dove 1v2 and died? Yeah, that sucks, but it happened. Let it go - one kill isn't the end of the world. Try rationalizing; realize that one or two mistakes isn't something to cause a fight over.
If you notice a teammate is playing poorly, raging will only make them more self conscious, and they'll likely play worse. Instead, try encouraging them, or give them advice. For example - "Riven has two kills on you top, just farm up, let her push, and I'll come gank your lane."
If someone is egging you on, don't respond. It'll only escalate the issue, which will likely cause you to say something that's 'toxic'. Fighting like this also causes you to lose focus on the game. Keep your head in the game!
If all else fails, if you have nothing to say, don't say anything at all.
How to continue play after everyone doing troll things?
If you've tried to get your team to group, tried reasoning, and nothing else fails, it may be time to mute everyone, and just focus on doing your best. Communicate via pings, and just focus on your role, and how you can help take objectives, win team fights, and ultimately win the game.
As Scarlet Shaman said, if you get out of a rough game, take a break! If you go into your next game on tilt, it's going to be a lot harder to be positive and play well.
Hope this helps! Best of luck on the fields of justice! :3