What emotion is hardest to fake?

Am good at faking expressions like smiling, pretending to be sad, pretending that am angry, that am in deep pain but the only emotion that is hard for me to fake is crying! Gosh i cant make myself cry thought am always emotional. I tried to shed a tear one day a friend's grandfather's burial but i really couldn't.

Hi! I'm not really good at hiding emotions. What you see is what I am feeling at that moment. If I am happy, I cannot hide it. It just radiates out of me and you can really sense it. And when I don't feel okey, you can really sense it too by the way I smile, or talk or even act. I can't hide it. I just do not know why. Though sometimes, I wish there was a way of hiding the feelings, the emotions. If I am happy, I can't pretend that I am sad... There's this line I got from the movie "THE TERMINAL" with Tom Hanks and Catherine Zeta-Jones when Zeta-Jones said "There is NO USE Pretending". I think I am that person. I cannot fake my feelings, I cannot pretend to be happy or sad if I am not.

The hardest is when you have to pretend you’re happy or just show my smile when everything is falling apart. I experience it before at school. I had a heavy problem and I had nobody to turn to and I don’t like sharing my problem to my classmates because they don’t know me and besides I don’t like sharing my private emotions to others before. And so what happened was I had to smile to my classmates, pretend that I’m all ok but some of my close friend asked me the end of the day if I’m ok because I’m quiet the whole day. It’s really hard to talk like you’re ok. Smile like there’s nothing wrong happening.

I have been told that I all my feeling and emotions are there for the whole world to see, I find it very hard to hide my feelings and emotions. People have told me many times my reactions to things are very funny.