I'm totally an introvert. There's absolutely nothing wrong with being introverted; that's how God made you. The difference between introverts and extroverts, as someone has explained, is how we recharge. My husband is an extrovert. When we're at a big social gathering, he's getting charged up and I'm getting drained. I usually want to leave earlier than he does. But we understand each other, so we can usually compromise.
It's not good to be alone all the time, though. We do need other people in the body of Christ.
As I'm thinking about it, I'm thinking about Jesus. There were times when He was surrounded by lots of people, teaching and healing. There were times when it was just Him and His closest friends (the 12 disciples). And then there were times when He went away to be alone with the Father and recharge. It seems like He had the perfect balance.