Nothing is more normal than obsessing about our shortcomings. It's a sign that you care about your performance, and that you wish you could be absolutely fabulous in every single aspect of your job. So naturally, you look to those ways in which you don't quite measure up to the best--and you try to figure out ways to fix those things. If only you could banish every blemish, you'd be beautiful.
But focusing on your shortcomings is also strategically stupid. And those who obsess about what they can't do risk real damage to their career.
There's another way...