If you’re ever feeling that you’re not good enough, remember that no artist thinks that they’re good enough. Here’s a quote from M.C. Escher, one of the finest draftsman you could encounter.
“Good God, I wish I’d learn to draw a little better! How much effort and persistence costs to try to do it well. Every once in a while the stress of it all drives me to the point of a nervous break down. It is really strictly a matter of persisting tenaciously with continuous and, if possible, pitiless self criticism. I believe that to produce prints the way I do is almost strictly a matter of wanting so terribly much to do it well. Talent and all that is really for the most part just baloney. Any school boy with a little aptitude can perhaps draw better than I; but what he lacks in most cases is that tenacious desire to make it a reality, that obstinate gnashing of teeth and saying, ‘Although I know it can’t be done, I want to do it anyway.’”
— From a letter by MC Escher to his son November 12, 1955.