For introverts. What happens when you're in a large group?

My girlfriend is definitely more extroverted than I am. I sometimes go to large gatherings with her, because she wants to go. I have noticed that in most places (not athletic events) an increase in people can negatively impact my health. Not in a large way, I will just feel slightly queasy in very large groups of people. Do other introverts feel the same?

For introverts. What happens when you're in a large group?
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