Most personality theories and assessment that the extraversion of an individual is part of individual differences. However, some would suggest that this can be altered depending on the situation and environment the individual is exposed to. Now, introversion is not a popular and desirable trait in most settings but this can be managed and now entirely changed. Just channeled and regulated. Why do you have it? This is something that the unconscious, cognitive, behavioral, environment and biological perspectives of personality accounts to. They have their own part to play on this nature-nurture paradigm of extrovertedness
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The answer to that question is Fear.
