The reason you might be "introverted" is because you are inferior. This is because when you socialize/try to socialize it may lead to negative conclusions with embarrassment, being made fun of, the interaction being awkward and many other factors this can be because you can't communicate with people well because you're not confident in yourself and have anxiety issues etc. If the "introverted" you were a chad you wouldn't be introverted because you would be more confident and socialising would lead to positive results making you do it more,
Most 'introverts" might not be introverts and just be inferior in factors like height, self esteem and attractiveness