On beating yourself up

Almost everyone does it. I'm not sure why.

After the fact (or even during it) all the blame, second-guessing and paralysis. We say things to ourselves that we'd never permit anyone else to say. Why?

It leaves us bruised and battered, unlikely to do our best work while we're recovering.
It hurts our knuckles.
It distracts us from the work at hand.

Perhaps there's a more humane and productive way to instill positive forward motion. I'm sure there is.

At the very least, this is a dumb hobby.