depend on the place, but from my experience, yes.
I live between Vietnam and the US (San Francisco and now Houston), and US society is designed to isolate people, especially if you live in suburbs/ urban sprawls. I attribute it to corporatization, car-centric cities, American individualism, and the general systematic issues relating to me being autistic, POC, immigrant.
In Vietnam, I know most of my neighbors. People within a neighborhood run different shops and services so you depend on them. For meat, I'd go to one neighbor. To fix my bike, I'd go to another. People are generally friendlier-- you greet each other when you see each other in the hall.
In the U.S, you don't talk to your neighbors, and especially in the burbs, things like how well your lawn and external walls look are what you're judged by. Since moving to a suburb in Houston with my family, Im stressed about the height of my grass, like wth!
Corporatization hasn't infected the Vietnam (though it slowly is). Instead of Starbucks or Mc Donalds, we have cafes and restaurants run from people's front door. We get to know the owner. Coupled with lack of regulation, every space is unique. It's a common past-time to explore and discover these spaces with your friends. I never feel like I don't know what to do for a day, because I can just pick a street and walk. My friends and I used to walk for hours and just sit down at a random shop when we want a dessert.
In the US, Houston especially, everything is located in a mall or complex. Malls are souless. Everything is corporatize. No one knows anyone other than the brand. When I call up a friend to hang out, we don't explore. We find a place to meet up and then we drive home. San Francisco is a little better because of its small size and public transportation, but still nowhere near the fun and friendliness of Vietnam.
All of the isolation can be compounded by the discrimination in the US of course. If you're poor and your car broke down? good luck. If you're queer/BIPOC, you'll face microagressions at best and active violence at worst. Discriminations is also bad in Vietnam, but because of how close knit and how culturally unconfrontational we are, people are more likely to come to an understanding or just let you be. You also get more communal support in general.
Not to say Vietnam is perfect. It's patriarchal and I certainly feel more comfortable being queer in San Francisco than Vietnam. And 9-5 work is 9-5 work anywhere. But still, somehow when I was in Vietnam, I feel like I'm part of a society. In the U.S I feel like I'm one person trying to force myself into it.
***EDIT: also you've just moved to the US (From that one thread you made), it'll take a long time to adjust and that's ok. You'll eventually find communities that share your interests online or in real life. Clubs, organizations, friends, forums etc. Those are the places that makes me feel more comfortable in the US.