I think it is a bit cynical to assume they are all "hiding" something, but yes, I think some are.
There is a reason comedians suffer from depression constantly, why you hear so many stories of famous comedians or comedy actors actually being super depressed in real life.
Robin Williams said, in so many words, that the reason he smiled and joked so much is to lift the mood of people around him so they did not feel as sad as he did.
With that said, I think a lot of happy people are genuinely happy. There is a psychology to it, and it's not selfishness, but these people simply focus on what they want and what makes them happy, and they don't dwell on sadness or past mistakes and stuff like that, so they are essentially happy.
Outside of biochemical imbalances and stuff like that, your mood is entirely in your hands. Look up "neuroplasticity".
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