I act as if I'm happy all the time but I'm really not.
Why do you act like you are happy all of the time?
I want to be a little different from the other people.
I imagine putting up a facade is tiring on you. Why not just be true to yourself instead?
So I should show my emotions and tell people my mood?
If you feel it's appropriate, sure. Trust me, it beats pretending all the time.