two cents

authenticity can be...
being (or at least truly striving to be) a person who does the right thing because you know it's the right thing, even if it's not what you want, or what will benefit you.

So that at the end of your life, no remorse. You may regret you didn't have power, or travel much, or make the news, or whatever; but you won't have to look back on a life of selfishness or worse.

before someone jumps in on me - no I am not saying there is anything inherently selfish in having power or travel or making the news. of course not.