Yeah, I feel the same way when I look at artists like LM7 crank out masterpieces like it's nothing. They understand color and light in ways I can't fathom, but hey, I know I can get there as long as I keep at it. I know that I figure stuff out every time I draw or paint something. Not much, but it's a step. And it'll probably take a million of them before I'm satisfied with my work, and then maybe a million more before I don't feel like a bug compared to the old masters. But if I'm going to throw in the towel just because the road's too long or because it's too hard, I probably shouldn't have picked it up in the first place.
Besides, most professionals have been breathing drawings since they were babies. They were, at some point, standing where you were looking at Monet or Dali and just thinking "what the fuck how." Until they figured it out, of course.
If they make it seem easy that's cool, but it honestly isn't. They're backed by decades of experience and centuries of theory and study.