How can you fake your mood and emotions?

My mum said that I need to smile more and kept myself even more piss Then my dad said about pep people not going to want to be with you. How are your moods. Is there a way to fake my smile and my emotions. I am already getting annoyed about my mum and dad. I said the same thing over again. Can't really be that mature talk. Is there a thing called masking your moods and emotions that nobody will tell what your real mood or emotion is. I just want to learn to do it.
How can you fake your mood and emotions?
How can you fake your mood and emotions?
How can you fake your mood and emotions?
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