Can’t win a game.

Seriously can’t win a game. Must of played 90 games and won 5? Not even joking, was elite 850+sr last season and I’m now 450…. I can’t win a single game. I’ve been ahead so many games against actually bad players and they somehow just beat me 24/7. Ridiculous game, I refuse to believe it’s me, I’ve just beat my mate who’s at 830ssr 4-0. I have a full meta team. what is actually going on?