If uncertainty is unacceptable to you, it turns into fear. If it is perfectly acceptable, it turns into increased aliveness, alertness, and creativity.
The ego tends to equate having with Being: I have, therefore I am. And the more I have, the more I am. The ego lives through comparison. How you are seen by others turns into how you see yourself.
The peace that comes with surrendered action turns to a sense of aliveness when you actually enjoy what you are doing.