Extrovert. I’m an extrovert. But I’m also an introvert. In fact whenever I take any sort of test to discover if I am more introverted or extroverted, I always score right down the middle.
How does this apply to writing?
Make your characters real. Real people are not 100% introverts, 100% of the time. Don’t stopper the creation of a wonderful, life-like character because you think they must be one way or the other. Real people are an awesome mix, so real characters should be too!