Is this game luck based?

I played by myself and got 2 trolls that threw their utility at me purposely the whole game all because I was a girl. I feel like I get teammates that are so lost and I just can’t rank up with them. I’ve been in the same division for 50 games because of this. Is it my fault? No matter how much I try to help my team or com, it’s just win loss win loss and a gamble if my team will be good or not