

You say you have mental illness. That might be so, I don’t know. But I will say that everybody, even people without mental illness, make mistakes like you described, especially at your age.
Everybody has dark and light inside of them. Being aware of this and being concerned when you make mistakes is usually a good sign that you’re not a bad person. Try not to compare yourself to other people. Compare yourself to your past self. Keep improving and try to make fewer mistakes. But don’t punish yourself too severely for making mistakes. Just keep trying to do better.
My favorite is my tablet computer with its digital pen and the default drawing software, whatever that is.
You see, I got the tablet for other reasons, and it came with a pen. What it all boils down to is that my favorite is whatever I already have. When I don’t have a computer nearby, my favorite is a pencil and paper.
I had to adopt this sort of policy because of my personality. I’m not a perfectionist, but like many people, I have hints of perfectionism. And this means that I think to myself things like, “I want to draw, and of course I would, if I only had this specific tool.”
But the truth is that I already had all of the tools I needed to draw. Always have. The important thing about drawing is drawing. I figure that if I ever spend a lot of time drawing and get good at it, then at that point, I’ll already know what other tools I want.