To me, life is like a game in this sense: Sometimes you win, sometimes you lose. It takes skill and performance depends on how you feel.
I find myself thinking about my mistakes pretty often. I just have to remind myself that the times that i have done something right greatly outnumbers the few, inescapable failures that happen. Its like this, your day could be composed of 90% Success and 10% Failure. Without realizing it, and still feeling like a failure, you just completed 90% of your day with style grace and success. Thats my current take on stuff.