Don't blame other people for your bad performance if you truly want to get better.
We all get bad players. I'm a support main, and I have more than my fair share of ADCs who can't kite, who don't realize they aren't frontline tanks, or who barely do more damage than Janna. Some of them can't even farm. Follow up? What follow up? As for focus, too many of them get distracted by Sona's light show. In the cases where focusing a support is warranted, like against a Soraka for example, they go way overboard and dive for her.
It's a learning experience, and you need to tailor how you play in anticipation for those sorts of bumps in the road. If I have an ADC who does all of those things I look to the rest of the map and pray. Luckily as many bad ADCs I get, I normally am facing ones just as clueless. Low ELO ADCs are like babies with a gun honestly.
The one that really just drives me nuts, is that they never, ever freeze the wave in Silver, and rarely in Gold. Caitlyns are the worst at pushing the lane in my experience. This gives me anxiety at the earlier levels because the enemy can farm safely under tower while we are put at a high risk of getting killed from a gank. I've pretty much given up on expecting my ADC to use their trinket, and luckily building Sightstone first works for every support. If you're always pushing, stop it.
If I can carry these sorts of people to mid game as support, you can do the same with the damage you're provided. Especially since this game is built around damage. I say mid game because usually if my ADC makes it to mid game with decent farm, and little to no deaths, we have a fighting chance with the rest of the team.
You want to stay away from champions like Vayne or Caitlyn because those champions need to be babysat. Lucian is a good pick if you want to become self reliant because of his peel. Another great one that's consistent is Jinx. Ashe, Kog'maw, and Miss Fortune are pretty good pick as well. All you need to do is stay alive and farm. Kills are a perk, but be aware when your jungler is coming to gank. An ADC's only job is to scale, and farm is the easiest way to independently do that. When your lane partner paints you into a corner always fall back to the basics. It sucks being bullied under tower, but sometimes you need to make it work in tough situations.
If you're getting better, you will progress.
stand in 
's traps constantly to "get rid of them" and ended up dying at level 2.
