Trying new roles

I'm a jungle main and regardless of what lane I try to play the other person in lane is usually much better than me. Trying a new role in this game is extremely tilting for me. The common response that I would expect is "The best way to get better is to play people better than you." I understand this concept, but there is also a point where you keep getting stomped so hard in lane that you can't learn anything constructive. This is the point where I'm at (been wanting to learn ADC). I usually am getting pounded over and over. I'm Gold 5 JG MMR, but my ADC is probably bronze 5. Laning against other golds, plats, and even high silver is just tilting.

TL;DR: Any suggestions on how to learn a new role that you are incredibly bad at?