Hmm... I don't usually like to tell people the exact meaning because it's up to interpretation. However, since you specifically asked, I'll tell you.

It's a very personal poem to me, because I'm born with a mouth that naturally turns downward. Thus, when I have a normal expression and am walking about, people think of me as unfriendly. And I really only smile when I laugh. And I'm not photogenic, so I sometimes look unhappy or unpleasant in photographs. Unfortunately, this means that people conclude incorrect opinions about my personality and attitude. 

Universally speaking, it speaks for those who may not express emotion outright. It may be that people are too shy or they just aren't in the habit of doing so. Whatever their reasons, these people are just as passionate about life as everyone else. It's just not right on the surface level, but deeper within. So many cliches could fit this theme. One possibility is "Beauty is in the eye of the beholder." Another is, "Don't judge a book by its cover.

I'm glad to hear that it has clarity and focus, as I often am too verbose, especially when I write essays. I write poems very sporadically, so I don't have the benefit of improving by writing every day. I write while in the moment, high on emotion. I'm glad that the emotion didn't overflow and confuse people.

Thank you for expressing interest in my work. And I will go over and read your work to give it my honest opinion.