extroversion vs insecurity

extroversion

noun
  • A personality orientation towards others and things outside oneself; behavior expressing such orientation. 

  • The condition of being inside out, especially in relation to the bladder. 

insecurity

noun
  • A lack of confidence in oneself; self-doubt. 

  • The state of being subject to danger; vulnerability. 

  • A lack of security; uncertainty. 

How often have the words extroversion and insecurity occurred in a corpus of books? (source: Google Ngram Viewer )