I am happy. I have lived outside the US since 1995. Many years in Italy and London and am now retired in Italy. The first year was kind of tough when we first moved to Italy. So much change to adapt to, but after that, life has been really good (my wife is Italian).
Now when I return home, I feel like a stranger in a familiar land. Would I be happier if I lived in a cottage next to a lake under the ponderosa pines of Colorado? Maybe, maybe not.
I 2nd this opinion. You don’t want to reach old age and regret the things you could have done.