Authenticity (in the Philosophical Sense) just means Ambition and having Life Goals

http://en.wikipedia.org/wiki/Authenticity_(philosophy)

1. We all want to be happy.
2. We are happy when we do what we want.
3. We should know what we want.
4. We should know whether we are allowed and capable of doing what we want to do.
5. We have authenticity when we can do what we want. 
6. Authenticity is just another word for Personal Success.
7. Authenticity is measurable by our lack of regrets using points out of 10.  (The fewer the regrets the higher our Authenticity Score, averaged out over a lifetime.)

http://thebattlefieldoflove.blogspot.com/2011/06/difficulty-of-living-with-authenticity.html  Feminism may prevent a woman from having Authenticity if it makes her afraid to say that all she wants to do is marry, have children and look after her family.

Sophie's World by Jostein Gaarder:

" ... our freedom obliges us to make something of ourselves, to live 'authentically' or 'truly' ".

http://thinkexist.com/quotation/strive-to-make-something-of-yourself-then-strive/363712.html