You're talking about important, related ideas. Confidence is just the expectation of positive outcomes. "Self-belief" or more commonly self-esteem is just about

You're talking about important, related ideas. Confidence is just the expectation of positive outcomes. "Self-belief" or more commonly self-esteem is just about one's own valuation of themselves. Both are related, and both positively correlated to happiness. Finally, "narcissistic confidence" is just arrogance. Also related, and you're right, it is a type of confidence.