Philosophical authenticity, as being oneself, in this regard, is not a virtue, nor is it desirable, for if we are bad or imperfect by nature, why be ourselves in the deepest manner as defined? And if it be a matter of personality, then it is not a matter of virtue but of style and congruence in certain instances - for being one’s own personality at all times is not possible or even proper, especially with those we first meet and in settings that require more etiquette, professionalism, and formality - leading to immodesty. It is not virtue to bombastically present our inner selves or personality to such people who don't care, it is brazen and self revealing unnecessarily - it leads nowhere. Rather, it is reserved for those we know well and those who are familiar with us.
However, there is a truth that may liberate us from this conundrum, that those who are born again have a nature that is perfect, liberated, washed, justified, and sanctified, and in being ourselves, we imitate Christ who is within the soul of souls, the heart of hearts.
To be oneself is to become as Christ, for it is no longer I who live but Christ who lives in me, so it is written, and it is the work of the Spirit of God and at times is as natural and organic to us as drinking water from a river.
We are not Christ himself, but we are one with him, and our new nature is remade and reborn in his image. It is the mercy of Christ and a great return through the flames of cherubic swords to the Garden of Eden, the original innocence of mankind.