Anyone who has studied Zen and has experimented with the concepts of such philosophy should be able to recognize it.i think they call your discription of the experience - "being in the world but not of it" - like the post about the fish in the ocean. It is my own experience that it is not a pervasive condition in most people, but there are enough people with similar experiences that it is not totally lonely either.
Ever heard of the Tao Te Ching?It is a secondary difficulty that we have to resort to words to share experience- so we can never be totally assured that it is the same thing, but i have found that appreciating the gift of observation and neutrality to externals that you have been given is all we have to do
"Chapter 1
The Tao that can be spoken of is not the eternal Tao.
The name that can be named is not the eternal name.
The nameless is the beginning of heaven and earth.
The name is the mother of the ten thousand things.
Send your desires away and you will see the mystery.
Be filled with desire and you will see only the manifestation.
As these two come forth they differ in name.
Yet at their source they are the same.
This source is called a mystery.
Darkness within darkness, the gateway to all mystery."
@thebigview.com
That's EXACTLY what we are talking about here.