I came across a wiki page recently which gave a name to the phenomenon we call, delusions of grandeur.
Now scientifically labelled as Dunning-Kruger.
It made me think about the opposing end of the scale. Most of my closest friends are artists, and most of them have given up on their art. Either because they couldn't get work immediately, or weren't accepted into the Uni they wanted, or just because they don't believe they will ever be "good enough" no matter how hard they try. They've instead taken on rudimentary jobs or chosen some other field that is less creative and more tedious. And when a creative person is forced into a life of tedium, it shows, and they change somewhat to accommodate for the lack of creative outlets.