My whole life I've struggled with feelings of inferiority and low self esteem. Even though I've been told by people I've been good at something I find reasons to shrug it off and look at the work of others and always consider it better than my own. Even if I felt good about accomplishing something personally I'd never show off as I've always felt that's poor form.
I think these feelings made design school difficult. Later in life when I felt like I had a good grasp on something I decided that it would be great to teach it. As an instructor I always felt like I was failing my students. Like I wasn't giving them the education they needed even though when my instructor reviews were returned to me all but one of them (over three semesters) said I was an excellent instructor. I can't remember what all the good ones said but the bad reviewer didn't even bother to bubble in the scantron section of the form and only wrote this at the bottom: "Those who can, do. Those who can't, teach.". It still messes with me and I don't think I'll ever forget it.
Well, today I discovered a definition for my frame of mind: