Why is my true authentic self fleeting? Because it's unfamiliar.
I've spent most of my life thinking that one of my many personas was the real me.
What aspect of yourself is the most successful? That is probably the part of you, or the persona, that you know the best. I'm still grasping for the old me that was successful in business and had piles of money. I was on a narcissistic high and it felt good until it all disappeared. I want the high back. Ah, but there's the rub. The Universe doesn't make it that easy.
My guess is the Universe is constantly pointing us toward our true self. The key is in the awareness of the persona wiggling it's way into the mix. My business-persona voice is constantly telling me to strive harder, to raise the bar just out of reach, and if I don't then I must be a loser. This is where it gets confusing, or not. We simply have to be aware of "who" the voice is. It sure as heck isn't my true authentic self that's calling me a loser.
The next time any voice berates something about us in an unkind way, just identify which persona is speaking (the parent, the social self, the wife/partner). That identification will immediately make us fall into our true authentic self. Practice, practice, practice with kindness.