Have I had particularly bad luck in my placements????

I'm headed to Bronze 5 and it's 110% my teams fault. Just Kidding.

But I'm wondering if I've had a worse time then other players in their placements because I'm playing ADC and low elo people autofilled into support don't know what to do often, and maybe I've just had sheer bad luck.

People have consistently told me that I'm mid bronze or low silver, but I might end up in low bronze with current predictions.

I lost two games because it was the start of the season and all the smurphs were on the enemy team; it was a total clown fiesta. Then I just played badly in one game and threw. My team and I got outskilled in another game. That was 4 of them (they weren't in that order). I also lost a game because someone straight up permanently disconnected at about 8 mins. At about 3 other games I had terrible supports who didn't know how to support or play their champs, while the enemy support was much better so I lost by about 2 kills or went even, and then the game was lost due to a variety of factors. In another game I had a team that went even in lane with the enemy more or less, I won lane in that game, but then my team refused to group no matter what anyone said, and the enemy team won because of that. In the next game I got a good support and won lane hard, but lost the game because the enemy was super fed and I couldn't carry hard enough. In this last game I just played my support did not feed, but was bad while the enemy adc had a support main on their side. My support was Bard, and he literally did not ult once in 20 minutes; he later only ulted once which ended up saving the fed enemy carry. I did not flame, but my team sure expressed their displeasure.

Is this usual for low mmr? Have I had it remarkably worse because I'm playing a dual lane? Or is this average and I simply didn't carry hard enough so I'm getting a rank that matches my skill fairly well?