My friend has a huge 4,000 sq foot brand new house in the South for 1/3 the average price in London. You cannot find that type of house even in the richest areas in Europe.
I don't know how amazing your friends house is, but while a 371 square meters house IS large, it's not absurdly large. And of course you find houses like that, whatever it is, in Europe.
But North America is fricking huge, and if you are willing to move out of the city it's hard to not grant you that at least: you have a loot of room.
Here’s [1] one of dozens of houses of that size currently listed in Bath.
As a European who also lives in a 4000 sqft brand new house in the south of the US, I wouldn’t wish that on anyone though. I’d happily take a 2000sqft house that was built at least to the standard of the second of the three little pigs, something which seems to elude construction crews south of the Mason-Dixon Line.
Regardless though, the size of your house says very little about the quality of your life.
[1]: https://www.winkworth.co.uk/properties/sales/lansdown-road-b...
And yet the quality of life doesn’t even begin to compare.