For me, the (self-diagnosed) root cause of that feeling is an awareness that there's so much that I don't know. When I read about insightful things or neat tri

For me, the (self-diagnosed) root cause of that feeling is an awareness that there's so much that I don't know. When I read about insightful things or neat tricks/pitfalls is a different person from a different background, but it turns into a mess of "wow, all these people know stuff I didn't know -- and there's so much more I don't know!" So even though I do the best I can, there's still a feeling of "Oh, geez, I bet someone else could do this way better. I'm probably missing so much or doing this in a fundamentally bad way."