I come from a country where a lot of younger people immigrate abroad and most of my friends and family have always said that it takes around 2 years to really get used to a place and for the sadness to pass. Maybe find a local group of new immigrants to talk to? Or sign up for some classes so that you can interact with others and adjust? Take your time, you just got to the US be kind to yourself and give yourself time to adjust.
Yeah definitely there was a 5.6(something in the 5s) in Jakarta when we lived in Bali and 200 people died it kinda made me paranoid.
I think after a while especially like you said in a country with good building codes you get used to it but the first few times it’s really unsettling.