Trying to grind plat rn, and I’ve had 3 leavers in my last 6/7 games, is this common in plat or have I just been incredibly unlucky?

I’ve been playing for a little more then half a year and I love the game. It’s my first FPS and also my first game on computer (laptop) And I’m stuck Iron 3 and peaked B1. It really demotivates and confuses me, when people say that they’ve...