First of all, 98% of the high performers on the planet have one thing in common. They are Introverts. Bill Gates is an Introvert, Warren Buffett is an Introvert, Elon Musk is an Introvert.
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Current tests consistently rate extroverts higher on the happiness scale than introverts. However, many of these tests measure degree of happiness using activities like socializing and interacting with the outside world, both of which extroverts need to thrive!
Introverts likely develop due to a combination of both nature and nurture. The way that your body's physiology responds to the outside environment plays a critical role in determining your level of extroversion and introversion.
While autism and introversion share some similarities, it's important to remember that they are two very different things. Not everyone who is introverted is autistic, and not everyone who is autistic is introverted.