Hahahahaha, oh man. I had to laugh reading this because I'm in a similar situation. Everyone thinks I'm this unusually caring, empathetic, kind person when NOTHING could be further from the truth! Everybody loves me too(which is how I like it, hahahaha ), they have no clue what's underneath my mask.

If you want to tell the truth to those close to you, I bid you good luck. Like r3b0rn mentioned, people tend to not believe me when I tell the truth about who I am. They just respond with a special kind of disbelief that irritates the hell out of me. Therapists don't believe me either when I start telling the truth. It's frustrating.

I get being exhausted by keeping up that front, it's why I started taking it down piece by piece. That's how I would recommend doing it if you so desire, do it slowly. Don't say up front, "oh by the way, I'm a narcissist." Tell them one piece of the truth at a time, for example just mention in passing that you're a very vain person for example and see how people react. Then once they have time to accept that piece, move on to another piece. It's not guaranteed to work because some people just want to blind themselves to the fact that not everyone is a selfless, empathetic, bundle of joy just waiting to burst forth... but that's my advice.

Good luck to you, and it's nice to see a new face here.