Yesterday I read something about authwnticity where the leading question was: Does this feel right to me?
Basically it said that as long as we act and speak in a way that feels right to us (and is not different from our pronciples and believes) then we are being authentic. For some personality types this is not a difficult thing to so, it comes naturally. But it does require some very deep knowledge of ones self.
PS — I think Margo from Paper Towns is quite an authentic person. But I wouldn’t want to copy her. I think copying someone is the least authentic thing a person can do. We can’t be someone else. Also copying seams like something a person would do, who didn’t find the answer to “Who am I?”.