This is NOT Shyness!

Introverts are invested in introspection, are never impulsive, reckless, defiant, or dysregulated (never borderline or psychopathic). They avoid over-stimulation. Unlike shy people, they are not apprehensive, anxious, or afraid of unfamiliar social settings. Introversion is a choice or a preference - not an avoidant, phobic behavior (like in social anxiety or social phobia).

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References

Eysenck, H. J., & Eysenck, M. W. (1985). Personality and individual differences: A natural
science approach. New York: Plenum Press.
Gray, J. A. (1970). The psychophysiological basis of introversion-extraversion. Behaviour
Research and Therapy, 8, 249–266.
Larsen, R. J., & Buss, D. M. (2018). Personality psychology: Domains of knowledge about human
nature (6th ed). New York: McGraw-Hill.

Further Reading

Costa, P. T., & McCrae, R. R. (1992). Four ways five factors are basic. Personality and Individual
Differences, 13, 653–665.
Goldberg, L. R. (1990). An alternative ‘description of personality’: The big five factor structure.
Personality Processes and Individual Differences, 59, 1216–1229.
Saklofske, D. H., Eysenck, H. J., Eysenck, S. B. J., Stelmack, R. M., & Revelle, W. (2012).
Extraversion-introversion. In V. S. Ramachandran (Ed.), Encyclopedia of human behavior
(2nd ed., pp. 150–159). London: Academic Press.