What are the preestablished standards of normalcy, and who established them? Humans? Science? God?
I guess time, standards of normalcy change with the passage of time or by some unknown powers who control us, may be! (Excluding the religion part, my thoughts might be different if I include it)
Normalcy? Behaving according to the expectations of people, nothing more than that! I would be assumed foolish and abnormal if I dance due to my appearance (Though I never wanted to) but others would be considered normal doing the same thing! That's how a common person thinks and I believe we don't want to be different!
You're right and maybe consider this example and blow it up to a macro perspective, considering societies and how norms differ in each, the example stands true. In one society what's considered normal in reference to mental health and existential meaning may not be in another. But I am beginning to realise that one way or another, with varying frequencies, it might just be a universal thing...