Do you feel this way within your field of talents, or do you just wish your field of talents were wider? I'm never satisfied with the extent of my talents even on the days when I'm satisfied with their scope, though I'm oddly reassured by the fact that stories are much more interesting when a group of people with complementary talents need to band together to accomplish something than when one omnipotent person can just go and do it. Particularly because then the omnipotent person needs to be kept out of the action for 9/10ths of the story for some sort of inconvenient reason -- or be really massively neurotic to the point of paralysis -- and I'd just as soon not spend weeks at a time trapped under a giant piece of kryptonite for the sake of the plot.

No really, I think like this. I'm strange, I know.

And while not directly on point, I've always felt that this is important to remember:
http://www.webcomicsnation.com/memberimages/080906case_snapped_open.jpg