In 2010 Mr. H and I went to visit a childhood friend of mine and see a bit of Northern California. The whole time we were there my friends girlfriend kept commenting on how authentic or unauthentic things were, from the Greek restaurant, the Irish pub, and bagel place, and telling us how you could really tell.
The whole time we politely listened and nodded our heads, never once mentioning that out of the three of us she had never been to Greece or Ireland and we had, but the minute we got in the car to drive home we could not stop talking about how crazy she was for this ideal of authenticity.
Even now four years after that trip it is still a joke between Mr. H and I and we will say things to each other like about how authentic our Swedish cheese is since we bought it in Sweden and then laugh and laugh.
Nowadays though authenticity seems to be a huge deal. When you travel you have to make sure to have an authentic (country/place you are in) experience and really every action you are to take is meant to be authentic and on and on.
The thing is I think that no matter what you do you are doing it authentically.
You go and make your choices based on what you like and want to do.
So what if 10 other people are wearing the same thing or your favorite restaurant is a chain.
If you like it and makes you happy that is living your life authentically.
Being true to you is being authentic.