My current mood:
I am super disappointed with my talent as an artist right now. This transition from using references to making my own stuff is kicking my once self-confident buttocks. I am challenging myself, so why does progress feel like failure?!
Yup. The more I know, the more I know I don't know. Insert other cliches here, too. Also, surround yourself with knowledgeable people that can help you analyze your hiccups, and give you targets to accomplish. It is the difference between becoming downtrodden and having goals to accomplish.
Onward and downward then upward!