The problem is the popular definition of the term “authentic” – this is NOT original, unique, true, or special.
Authentic is to be: Self-done, Self-made, Self-created, Self-origin-ed.
So being authentic is a rate of how close one’s character matches their ideal self/ego.
And there is the rub. The goal of ideal self, or ideal ego – what you want, and why you want it. Who you Are, how you were made, and who you were meant to be.