The difference between narcissism and confidence is:
Narcissists hate themselves and compensate for that by manipulating, tearing people apart and acting as if they are the best, and they won't acknowledge the bad that they do as bad.
Confidence means you can acknowledge the good AND the bad, and you can love yourself even a little bit.
It's one aspect of narcissism, but it's an aspect that empathetic people pleasers have a really hard time staying away from.