That's my entire life and I never experienced it as impairing/uncomfortable.

I had a religious education and obsessed about how people can become dogmatic for random things, like being randomly born in a random religion or country. Those guys would be just as brutal if they were born on the other side. They are exactly like those they hate. They love their country and religion, their tribe. I used to imagine them side by side, switching roles, fighting under different flags....etc. To the point where the different groups become one as you wrote.

I'm not much into : is the air in my lungs part of me? Rather : How much of me is inborn? How much is contextual? Is there any determinism in my life? Am I really free? Does luck exist? Is it an illusion? Cuz your intuition can push you towards/away from some sort of situations. You'll call it luck, but it's the unconscious you. Or does luck really exist? How much bias do I have? Where does it come from? Where do my morals come from? Do I have a genetic memory? How much am I like my environment/ancestors/education? Why am I so different? Why bother if many attitudes (sensitivity/empathy) are inborn? Am I looking for an objective truth or a convincing rationalization?....etc?

The only undesirable effect of these thoughts is a big detachement.