I think 'normalcy' is sometimes a facade and sometimes an illusion Depends on what people fear. Some people fear not fitting in, others fear being mediocre or ordinary.
In my experience I have known some fairly conventional people who fear being viewed by others as conformists or part of 'the herd' so they dress strangely, etc to differentiate themselves.
And I know plenty of people who hide a lot of trauma, quirks, kinks or problems behind an outward appearance they believe is more socially acceptable.
Generally the more 'abnormal' a person feels they are, from what I've observed, the more they try to 'act normal'.