Why do I keep losing?

I am so confused as to what keeps happening, I do well in most of the games I play but for some reason, I KEEP LOSING. I know there are some blaring things I need to improve on, but is there something basic that I'm missing? I have a positive attitude, check the mini map, I ward often (being a support main I ward a lot). There is obviously something that I am missing and if someone could check my match history and point that out I would much appreciate it!
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