What more can I do

Threw out my league career I've been constantly told to never insult my team mates and encourage them to do better, And if I do that I should be able to at the very least be able to get Silver And thats just what I do encourage them and never insult them (at least in ranked) But I just cant win a single match for the life of me, My last match in particular is what threw me over board I said we were just hitting bumps and if we all kept trying the match would be ours things like that, and I myself won mid lane got bot roling and helped our jungler invade but in the end it just wasn't enough but it was just afterward when they flamed me constantly I just couldnt handle it and I lost my temper (IRL I still didn't say anything in game)

So I guess Im not exactally sure what im asking for mabye mostly I just needed to rant, I mean its a bother this game is the closest thing I have to being good at and being bronze is just so depressing, but I suppose I just need to face the fact that I'm just not good enough to be able to do anything in my life or league its just angering. to try my best and to try to keep a positive out look and still only have a 33% win rate this season.