What the f*** is up with my matchmaking?

Out of 8 games... Only one is a victory and the rest are lost all because of my team, in one game there is a troll (Someone literally tried to play adc Thresh), in another afk, then theres a jungler who feeds other lanes or doesn't come at all. How am I supposed to play ranked and get a rank when this stuff happens when im trying to just warm up?
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