Smile?

My supervisor asked me yesterday night at work, "Chris, you don't smile a lot do you?" i told her that i don't. And she asked why. Well she didn't have to ask that. Anybody could figure it out. i told her i wasn't a happy person. She asked why again. And i couldn't really answer that. Theres too much within me to just tell anyone about. There are a lot of things i don't want people to get involved with it. Its just my problem. i do smile and laugh though. When i see something funny, or when i hear a joke. Other than that i don't really find any reason to smile. i'm just getting by. Theres no point in wasting the energy to smile. At least i don't frown. It takes more muscles to frown than to smile.