As they say, the only way is up. You don't have to wait for a "down" moment in your life.
When you make a mistake, or when out of the blue Mr. Adversity just shows up, just keep going.
When everything's fine, still, just keep going!
Let the outside world do its thing, but never ever compromise your attitude and your principles.
In no time, you are confident! Even without knowing it

Thanks for the post, corbetoc1!