I Can't Win Games Anymore.

So my last few games were pretty bad, i inted way too hard and couldn't recover no matter how hard i try. My 3 last ranked games were a disaster, i played so poorly, so did my team, but thats not the main thing. The thing is... I can't win games anymore, i can't carry my team to victory, even when i win i feel like i dont deserve to win, that my team carried me. I also have a habbit of blaming my support for my poor choices ingame. I seek for help, can you fellow summoner give me some advice how to break this losing streak and turn it into winning streak. Do I need to stop playing ranked? Do i need to stop going AD carry and go to my secondary role?
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