I feel your pain. Same thing here, I'm not as old as you but same thing, basically. I'm extremely bitter about my life and not having a life. The way I see it - it was because I lived in other cultures and countries and got used to and exposed to that. So when I came back here, I never adjusted to this place, and always felt like it was missing something (and it is...like an actual real culture) ...and couldn't get over it.
I spent my life being miserable waiting, hating and thinking about how to make it good and better again; things I did not like about this place. Wanting more generally out of life, and all that. I always felt like I had an entitled sort of attitude (I know that's bad...) but that's just what it was, I'd lived so many places and was worldly and achieved lots, my dad also taught me to have high standards etc. So I turned my nose up at everything here, waiting for something better. I got nothing......and now I'm more miserable at having a life of regret and bitterness than anything.
Yeah it sucks, the only thing we can change is ourselves - I suggest you do that, or at least try to.
Good luck, for me too