How to Be a "Happy" Person

My preferred personality is "polite". I love polite people. Good manners. Good social etiquette. Those who intuit back-and-forth communication. If everyone was polite, I'm convinced the world would be a much more enjoyable place.

But, there's another kind of person. "Happy." And not just happy, but bubbly. Always in a good mood. They always put you in a good mood. They energize you.

So, shouldn't I want to be that person? The only problem is, being that person is exhausting when it's not natural to you. So, what do I do?