What being an introvert means to the minds of sixth graders

So, today I was teaching my sixth grade general music class about Frederic Chopin, who was an extremely introverted composer of the Romantic Period. I first asked if anyone in the class knew what it meant to be an introvert. No response. Then I continued to explain how different people have different ways of getting energy and that extroverts get their energy from being around many people. Thinking that this was a decent explanation, I again asked the class where introverts might get their energy. One girl raised her hand and said confidently, "From sugar." The rest of the class agreed and it was all I could do to stifle a laugh. So that leads me to the question: Are we all introverts? A thought to ponder for a Monday...