it's a sad case if you lie to yourself.
when i am sad, i can tell everyone that i am fine. no worries. perhaps i can also console myself that everything is alright as i can handle it. doing other stuff, keep myself as busy as i can or even laugh loudly when talking to others. well. what's the point to lie to myself? when it turns into dark night, sadness will invade me again. so, cry as loud as i can in my own room. i believe that God creates tears for multipurposes.
if i am happy, just laugh or smile! it's an indirect way to share your happiness. hahahahaa.
be happy when you are happy. be sad when you are sad. life is not that complicated, isn't it?