OP, a couple of points. Sorry, but you do give the impression of looking down on other people. Perhaps this is unintentional, but that’s how it comes across.
You realise people have (wrong) pre-conceptions about Americans? Be aware of that and make sure you don’t mistakenly say anything that could be interpreted as boasting or being better than everyone else.
Conversely, stop having pre-conceptions about those around you. Apart from the rudeness, it means you’re potentially losing out on some good friends. It sounds like you’ve already decided the people around you aren’t for you, but I don’t think you’ve given them a chance.
You categorise people by their motherhood, but there’ll be far more to them. Many SAHMs start of by talking about children because that’s a good opener. But they can then move on to travel, books, careers, academia, sport, philosophy, etc etc.
You’re writing people off without properly knowing them!
I think I can work out roughly where you are in the U.K. I was born there and I grew up surrounded by a wide variety of fascinating people who might have been from the West Country (I hate that term as it can be disparaging) and lived in villages, but were clever, knowledgable, widely travelled, well-read....
They’re all around you, OP! But you’re just assuming there’s no one like you there.
Check you’re not coming across as stuck-up, start to chat (yes, even if it’s initially about children), open your mind and look for things you have in common. No matter how people seem initially, you’ll find there’s far more to them underneath.
Likewise, they’ll find there’s more to you than your privileged upbringing.