authentic vs comfortable in one's own skin

authentic

adj
  • Conforming to reality and therefore worthy of trust, reliance, or belief. 

  • Of the same origin as claimed; genuine. 

  • Having the final as the lowest note of the mode. 

comfortable in one's own skin

adj
  • Relaxed and confident in one's manner of presenting oneself and interacting with others; conveying the impression that one has a clear, satisfying understanding of one's own abilities and situation. 

How often have the words authentic and comfortable in one's own skin occurred in a corpus of books? (source: Google Ngram Viewer )