Yeah I understand that too well. I was originally a mostly traditional artist so transitioning from traditional to digital was such a difficult thing to adjust to. ( Now I'm not the greatest at traditional anymore haha ) but lining and coloring was always my weak points. It took looking up tutorials to get where I am and to be honest, I'm still not happy with the state I'm in. My wife always tells me that an artist will never be truly happy with their work and will always strive for better! <3
I appreciate your words and how sweet you are! Just keep working at it and give yourself time and patience and I know you can do it. I used to be the type of person that wanted to get a piece done within' a day and because I was trying to rush, my art suffered. Know that you can take your time and also that sometimes redoing things completely is a lot better than being unhappy and accepting a result you're not satisfied with.
I know you can do it!!