Courage is taking risks, persisting, falling down, and getting back up. Repeat. This doesn’t require confidence, it is what builds confidence.
When you walk into a room full of people, do you notice those who are present and focused, rather than distracted? Do you sense those who are engaged in the moment?
The word stress has become a catch all for lots of emotions. Get more discerning - rename it as irritation, fear, anger, worry, sadness... or another description.