Roads not taken
Kick yourself all day about the stupid thing you said, the bug you introduced, the promise you failed to keep. That's pretty common.
Perhaps you should think about the stock you didn't buy, the innovation you didn't pursue, the compliment you didn't give?
Way more productive, I think, to push yourself to be more in the world, not to encourage yourself to hide.
We respond to what we keep track of. Too bad we're not better at keeping track of how many failures we incorrectly predicted, how many innovations we failed to notice and how many apparently risky steps we failed to take.