Introverts are full of surprises and contradictions. Most people think that being introverted means you're a recluse but it's far more complicated than that. While some introverts prefer seclusion, some of us enjoy human company, just in smaller, more manageable doses. So while our extroverted friends are introducing themselves to everyone at the function, we'll find the cat in the corner enjoying the cacophony of mirth from a distance. And when a stranger tries to shake our hand or go for a hug, we lean back and offer a polite wave instead.
Balance. Life is all about balance when you're a secret introvert. Because if you let the party people rule your life and schedule, it's unhelpful for your psyche and tough to enjoy the hangouts. But if you see your friends once every 2-3 business months, then you'll actually want to be around them! Horray for long-distance friendships, long bouts of silence, and the independent ability to be perfectly fine on your own.