You're welcome general **** for brains. Unless you play with a team there is only 1 thing that doesnt change in every loss you have. YOU.
Get lol replay and watch the games on how you can do better. Help your teammates understand what they are doing wrong. I can bet all you do is rage and say "gg noob team feeds".
My post was serious. Get better. Watch replays play better. I used to be like you. I still rage sometimes. I was at 650 elo 5-30 record. I got lolreplay and decided to get better. Now 80% of the time im the only one on my team with a positive w/l.
Duo queue is the best bet if you don't want to make teams. Preferably lane with them on bot lane but the best is to have a jungler friend who's good enough to be able to carry team if needed and you be a very vital role in team comp. Always ban troublesome champs that are very difficult to deal with like Malphite but if you have first pick, make sure to pick up those OP champs and trade with your team who can excel with those champs. Other than that, all I can tell you is try harder. I started off with 1100 ELO average and now I am in the mid 900s. You don't see me complaining. I always do Sona or support chars and I don't feel like carrying the team using an OP champ so I sure won't complain about it as well. That's my choice; I learned to suck it up and deal with it. You have to do the same.
We're not trying to be a ****, we're just giving you the best objective solution that can HELP remedy the situation. To actually solve this issue you got going on 100% depends on you.
And getting LoL Replay and watching yourself will definitely help improve. Sometimes you don't realize you are making a mistake while you are playing. Rewatching yourself through LoL Replay, you might be surprised at some of the careless mistakes you make that cost you big time later on. I learned to generally be better at ward placement as a support through LoL Replay as well as knowing when to play passive and when to be aggressive as Sona. THere's a lot you can learn just by watching yourself. And maybe look at some pro's play. You'll learn a lot.