So sorry you are going through this. A hobby should be for enjoyment, so do what you can, in shorts bursts, without any notion of how much time you ‘should’ spend on something. Each new technique will take time but be rewarding. You are probably far more skilled already than you give yourself credit for. I reckon I would struggle to draw a stick figure. I would be supremely impressed by anyone who could produce something even close to those shaded examples!