Everything changed when the Solo Q Attacked

I just can't, even right now. I just can't.

So Here I am, in Bronze III, where I was placed, and lose the next 4 games, fearing i'm about to get demoted with my next game. I main support, but I can play most lanes to varying degrees, at the least, I can farm safely and not feed. In every duo with a higher elo player, I'd die no more than twice, and get loads of assists, possibly 1 kill, sometimes 2. Not usually stolen, but from tower divers that miscalculate. even when i'm not supporting, and I played as Top or Jungle, I farmed well, ganked successfully, and got my lanes fed for a successful win.

But then I solo Q, and no matter the lane I pick, I always end up losing. I want to blame the team because we either have an afk, bottom lane throwing themselves repetitively at the enemy thinking "maybe THIS time we can do more damage!" or a with a personality disorder who thinks he's a ward.

Is it truely my lack of skill that loses all of these game? I'm just fine when playing with plats/gold, against plats/golds, but when it comes to solo Q the game turns around. Even if I don't feed, I still end up getting deaths racked up at the end of the game trying to save the nexus or inhib turret, but getting dove on (even on nexus turret, 4k hp with lifesteal and suckkkkkks) or worse, are bronze players truely better than golds and plats? Or am I extremely lucky, and because i've been playing with golds and plats, my elo places me with bronze smurfs? the last seems likely, but the point still stands of, why am I stuck with the trolls or unskilled players. I mean no offense to them, but they seem like they haven't even quite gotten to level 30 yet, let alone rank.

Advice please! Should I duo? I've always disliked that but idk how to get back up to silver or gold again!