As someone who grew up in the US and then moved to the EU; I came here to say exactly this. You leave your private house, get in your private car, then go somewhere. You could live 10 years beside someone and never know their name.

Here in the EU, I know most of the people on my street because I walk by them every day on my way to the store. In the US, even though I lived less than 1 mile/500ish meters from the store, I couldn't walk there if I wanted to.