and here are the reasons why no one tells you to go be a third cultured person:

its not easy.

When you are one of us,
different and foreign are not even a blip on your radar,
(because my life has always been detachment - meeting and smiling and beginning to say "hi", only to have to wave goodbye.)
you will always be different and foreign, belonging to a place is a wish and not a reality, home has always meant people as opposed to a place (not that people are at all constant).
leaving is normal too, just pack your bags and go go go, doesn't matter if you never come back, onto a new place now, and goodbyes are hard -- but seldom unexpected.

when you are one of us, you are shifting and turning and never never staying, always changing and moving forward, frighteningly frighteningly fast, all impermanence and hopeful, but broken promises-- you will perhaps stay in one place for some period of time.
(you will never belong)