A few ideas I picked up recently. Writing them down.
One is about failed attempts. Say something cost you money and cost you time. Before you beat yourself up over it, ask: if that time hadn't gone there, was there something of higher value it could have gone to?
If there was, stop agonizing and go do that thing. If there wasn't, then the attempt itself was worth something, and the time wasn't wasted.
Only the weak crave certainty. The strong make a new world in the middle of shame.
And one more: success isn't getting a result every time you try. It's still being willing to try after all the times you didn't.