Why is doing art so tormenting? Does the process ever gets easier?

Yes and no. It all depends on how much time and work you are willing to put to your work.

You get better at the stuff you're currently bad at, but I don't think I'm alone in saying that even if you reach a point you'd have loved to be at a few years ago, you'll just want more.

So certain things get easier and more intuitive, but your goals generally outpace your ability.

I suggest you write down some concrete goals. When you reach them at least you'll get a sense of accomplishment, rather than sleepwalking through it all.

Learn your fundamentals and then you have the tools to paint anything you want. There's no getting around it. If you don't know where to begin study line>shape>perspective>form>gesture>construction>anatomy>light>color

That's the shortened version or go to Watt's Atelier and to catalog and look at the courses in order to get an idea of what you should be studying.

>>2640617
Oh yeah and decide what you love and draw it, ALL THE TIME, using your new fundamentals, that's the easiest and fastest way to learn. I drew probably thousands of lewd women when I was practicing and I made bounds in progress.