A whisper we sometimes hear in our heads is “not enough.” It plays out in the 
background: not good enough, smart enough, strong enough, educated enough, rich enough, understanding enough, persistent enough, timely enough, disciplined enough, loving enough, handsome enough, ambitious enough, interesting enough, focused enough, wise enough, pure enough, obedient enough, rebellious enough, successful enough.
It seems like everyone has that niggling thought crop up sometimes. It shows up when they are trying to do something hard or different than before.