I can relate. What I would say is that it got easier as mine got older, particularly when they neared secondary school age.
It is temporary - that having to go to the school twice a day, although I know it seems like forever sometimes. My dc are well liked and do well at school, despite being considerably less wealthy than the majority. Although they were left out of a lot in the early days.
I think fitting in is something in your own head a lot of the time. I've noticed here that it isn't actually about your wealth, it's almost about how you market yourself. Over time I have a network of people around me who don't care about those kinds of things - but it took a long time. And there were many moments where I desperately wanted to move away.
I feel much better about it now. We are who we are. Take us or leave us. And I don't have to go to that bloody school every day - that's a big factor. There's a great big world outside of it.
People are funny about their dc when they're little I think. They want them to find them the "right" sort of friends. As time goes on they become their own person and pick their own friends.
Yes six year olds made comments about our home. The same dc don't now they're older. They've got through the boastfulness stage. And they're far more concerned about whether you like Minecraft or dancing or whatever than how big your house is.
So just to say we rode through the storm so to speak and it is better on the other side.