League officially sucks now

I want to know why and when league turned into a game that ended at 5 mins. Every single game I play, it feels worthless to try. Like I can do everything in my power to win lane and do everything to just win, yet my whole team feeds or one person on their team solo carries. I don't know what to do. I used to be able to play who I wanted to and do good and my team would do fine. Now every game I play, there is no choice to play. All I want is to play the game I love and get better and improve, but riot won't let me, they won't allow me to have fair teams that can actually do something and not just flounder after 5 mins. I wish for a game where I can play and have fun, but riot wont let that happen.
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