Because there's scientific evidence strongly suggesting otherwise. About this you are mistaken: https://en.wikipedia.org/wiki/Extraversion_and_introversion ht

Because there's scientific evidence strongly suggesting otherwise. About this you are mistaken: https://en.wikipedia.org/wiki/Extraversion_and_introversion https://en.wikipedia.org/wiki/Extraversion_and_introversion Despite these differences, a meta-analysis of 15 experience sampling studies has suggested that there is a great deal of overlap in the way that extraverts and introverts behave.[33] In these studies, participants used mobile devices to report how extraverted (e.g., bold, talkative, assertive, outgoing) they were acting at multiple times during their daily lives. Fleeson and Gallagher (2009) found that extraverts regularly behave in an introverted way, and introverts regularly behave in an extraverted way. Indeed, there was more within-person variability than between-person variability in extraverted behaviours. The key feature that distinguishes extraverts and introverts was that extraverts tend to act moderately extraverted about 5-10% more often than introverts. From this perspective, extraverts and introverts are not "fundamentally different". Rather, an "extravert" is just someone who acts more extraverted more often, suggesting that extraversion is more about what one "does" than what one "has". That article goes on to say: Humans are complex and unique, and because introversion-extraversion varies along a continuum, individuals may have a mixture of both orientations. A person who acts introverted in one situation may act extraverted in another, and people can learn to act in "counterdispositional" ways in certain situations. For example, Brian Little's Free Trait Theory [35][36] suggests that people can take on "Free Traits", behaving in ways that may not be their "first nature", but can strategically advance projects that are important to them. Together, this presents an optimistic view of what extraversion is. Rather than being fixed and stable, individuals vary in their extraverted behaviours across different moments, and can choose to act extraverted to advance important personal projects or even increase their happiness, as mentioned above. In short: The dichotomy is a false one. To imply anything else is just pop psychological BS, albeit fashionable BS right now. He's talking about social anxiety, not introversion. That's a whole other problem, and is considered an anxiety disorder. If it's resulting in career limiting behaviour, it's probably worth therapy, such as CBT, to try and resolve: http://socialphobia.org/social-anxiety-disorder-definition-symptoms-treatment-therapy-medications-insight-prognosis http://socialphobia.org/social-anxiety-disorder-definition-s...