There is an unbelievable amount of confusion around the differences and similarities between introversion and social anxiety, or any form of anxiety for that matter. For better or for worse, there just seems to be a lot of crossover between the two in terms of emotions and preference so I suppose the confusion is understandable.

Sources:
https://scholarworks.uni.edu/cgi/viewcontent.cgi?article=1312&context=grp
https://www.mayoclinic.org/diseases-conditions/social-anxiety-disorder/diagnosis-treatment/drc-20353567
https://www.psychologytoday.com/us/basics/introversion

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