Am I that angry? does anyone else have this problem?

I get really pissed iff with who treat me as if I am angry or keep on asking me whats wrong like I have a problem, I can deny that I do however I know they don't believe me, somtimes my speech can be both fast and louder than most people but thats only because I have a deep voice adn my face does look naturally morbid and sad at its resting rate but keeping up a smile is hard for me when everyone else around can rest and sound fine?