insecurity vs shyness

insecurity

noun
  • The state of being subject to danger; vulnerability. 

  • A lack of security; uncertainty. 

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

shyness

noun
  • The quality of being shy; a fear of social interactions. 

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