Extroverts, those outgoing, gregarious types who wear their personalities on their sleeve, are generally happier, studies show. Some research also has found that introverts, who are more withdrawn in nature, will feel a greater sense of happiness if they act extroverted.
Experts aren't entirely sure why behaving like an extrovert makes people feel better. One theory is that being talkative and engaging influences how people respond to you, especially if that response is positive. Others speculate that people get more satisfaction when they express their core self and opinions. Another possibility: Happiness might come simply from having successfully completed a goal, such as giving a speech.
We can't act like extroverts because, well, you know, we're introverts. If we could be outgoing and vivavious, we would be. And I don't care ow many studies they do, pretending to be something you're not is not the way to happiness.