I feel this. I did really poorly in school (ADHD), didn't go to college, and my last IQ test yielded only marginally above average results (and for all I know I just guessed lucky or am good at pattern recognition). But despite feeling like I'm still a naive and immature idiot with no idea what he's doing, the more my wife and I associate with the parents of other kids in my daughter's class, the more we realize we're quite possibly the only fucking adults in the room.