Self-exploration?
Now as I am ageing by the second I am really starting to realise this,personality,popularity and sexuality being the huge three.
Somebody might need a punk-rock song about being alone or being betrayed or whatever it is to...well...reach out and find there's someone out there sharing your music,(and someone really famous).For me that kind of music just rushes into my mind and goes,as the 'holy sensation of self-realisation'.
If people,or the sensual people,through history,hadn't really accumulated these ideas about the stages in life,or had things of different sorts classified to do the 'analysis',through which they'd be assured that the stuff they wanted to know is actually factual and in accordance with rationality as well as nature itself,we wouldn't have got these ideas about how we are going through this problem in our teens,that kind of crisis in our 40s.
Sometimes if we hadn't got these in mind,we wouldn't even be aware of it.
But unfortunately in the name of 'having a better life',we do know these well enough,look how we've contributed to the human civilisation and the economy with those huge self-help section in book stores.Also,we tend to jump the gun and over-suspect as we turn into that phase of life "Could I have possibly gotten it?",then more often than not it's the psychology of it rather than the actual physical factors that pushes us comfortably into that programmed mode,which presumably  can be well expected.I guess it's the 'self-realisation of predictions',or whatever it's called.

So maybe I am just fooling myself thinking having these doubts is actually a sign that I am one cool kid.

Or whatever.