Socializing is a skill and requires exercise, but everyone has its own unique limitations and skill levels. Not everyone throughout history has led an exceptionally social life filled with constant conversation. There are plenty of references to quiet and seclusive people in the bible, for instance. In the Middle Ages, you could join a monastery or convent, which provided a community more suited for introverts. Right now, I wouldn’t be surprised if many introverts feel there is no escape from the extrovert modern life.