How do I farm when jungle has no vision?

So I'm trying to improve as ADC and the one thing I don't know how to do is playing and especially farming from behind. Often times, I lose lane and die a few times and lose tower. Normally, I'd want to keep up in farm, but how do I do that when my jungle has no wards? The worst feeling is when the wave bot is pushing towards the enemy and it's past the river. I only get 2 wards including a control ward, which isn't enough vision if I'm the only one warding. Do I go mid and take cs/exp from my mid?

Like, I see pros still keep up in cs even when they lose lane and first tower, but I honest to god don't know how they do it.

My question is, how am I supposed to play? Do I just accept the fact that I can't go past river and just aram?