"...Of course we want to perform at our best in these situations, but I think the word ‘confidence’ creates more problems than it solves. I usually advise clients to change the word to ‘enthusiasm’. Here’s why:
1. Confidence is about you - enthusiasm is about your subject
2. Confidence is about you (again) - enthusiasm is about others
3. Confidence is impressive - enthusiasm is infectious
4. Confidence is certain - enthusiasm is creative
5. Confidence is serious - enthusiasm is fun"
via Wishful Thinking