Why when I look into my own eyes am I unsettled by the misery I see on my face, even when I'm happy or smilin?

I see a sadness and misery on my face that is caused by the torture I have had to endure in fourteen years. I cannot communicate with anyone because I stutter and I can't think of anything to say, even with my family. When I laugh, my laugh copies the laugh of the people I am with, so everyone hates my laugh. People say I have a nice smile, but if you look into my eyes, I see nothing but sadness, even when I am totally happy and smiling. My eyes don't even curve up on the outside like most people's because I do not smile enough. Why would my face settle into this mask of my own misery?