Aight bruh. Shake it off.
I'm not the greatest player ever skill-wise, but I'm gonna hand you the keys to the kingdom of dealing with other players in this game and yourself.
Its time to get Zen
1.) You don't need all chat. You can turn it on later when you've become steel against tilt.
2.) You don't need your ally chat for good communication. Pings are much more effective anyway. You've got an enemy vision one, "im going here", enemy missing, caution, etc. Use them all game for everything. It'll help raise your mini map usage and awareness anyway.
Don't automatically mute your allies. There are positive players and people willing to help and sometimes someone will make a good point or play call.
BUT (here come the caps so you can burn it in your memory)
MUTE. IS. YO. FRIEND. lol AS SOON AS YOU GET A WHIFF OF NEGATIVITY, MUTE. DO NOT, I repeat, DO NOT get baited into having pointless conversations or waste your time reading a stream of insults/pettiness. The saying here is MUTE. REPORT. MOVE ON.
3.) Those players not focused on winning or staying positive (ragers, flamers, trolls,) are now "Dog Poo" (not literally this is a mental technique).
You know Dog poo exists. You don't like dog poo, but when you come across dog poo you don't freak out. You say "oh look, some poo.", and you go about your day. The same applies to any player who is muteworthy. Don't waste your time hating. You're here to play the game. Those who don't are simply poo for Riot to pick up via report. Not your problem.
Would you play with the poo and expect it to be a more pleasant experience lol? then don't listen or engage with negative conversations in league XD
4.) You can only control yourself. This you must keep it mind so you don't become the player we just talked about. Not everyone is at the same skill level, and sometimes people can be good and they just happen to be having a shitty shitty game in the one they matched with you. Unless you yourself have something positive to say don't say it. rage aloud if you have to, but in game be Zen, be encouraging. If you lose, let it go. There are an infinite amount of possible future games.
5.) League is about consistency and objectives, not individual wins and KDA. KDA is nice, but don't fall into the thought trap of it equates skill.
Even a streak of 4 or 5 games shouldn't deter you. If you feel yourself going on a losing streak, just break. You may stay Zen in game but if you get 3 back to back trolls you might want some air IRL. Just keep making sure you keep your cs up, your deaths down, focus on towers and dragons. If it seems like you're stuck do more research and practice.
Hope this helps.