What drives a covert narcissist to create exaggerated narratives about their past, even when others know the truth?

Does it ever scare you sometimes thinking how a celebrity sings about everything they feel? Not necessarily scare you but make you wonder how one can be such an open book with their emotions, especially to the whole world?
How can someone train themselves to have more empathy and enough compassion for working in healthcare related roles such as nursing or more?