Ah, sorry, it looks like I was unclear. I meant "What makes you think that so many people are better at programming than you?", not "Why are you so bad at programming?". I had assumed that you were comparing yourself to the general population, although now that I see you have clarified that you were comparing yourself to other programmers, the 95% estimate makes a lot more sense. Giving people estimates of your percentiles without telling them the population you are comparing yourself to is almost useless.