Imposter Syndrome? Am I the only one?

Not really a rant but just needed to vent. So lately I have been isolating myself quite a bit over the past year or so. Just focusing on my family, my own life and other things. I have not really tried to keep up with friendships, neighbors or anything like that. I actually have always been like that for the most part. When we bought our home in the suburbs, I loved it and was outgoing! Made some mom friends here and there. But after a while I started to feel really out of place… like an unbearable feeling and I still do. I came from a very different background, lower middle class and a bad childhood. Now that me and my husband are successful, bought a nice home in a nice neighborhood, I just feel like crawling into my shell and never coming out. I used to think it was everyone else who had a problem with me but lately I’m starting to think I’m suffering from imposter syndrome. I feel like I don’t fit in here, because everyone seems to be very materialistic, gossipy, stay at home moms, while I am the complete opposite.. although I am proud of what I have accomplished and happy because everything we have we earned tooth and nail for it, somehow being here makes it feel so insufficient to everyone else. I feel like I’m having to “keep up”. I work really hard to be where I’m at, and I just feel like I’m surrounded by people who I can’t relate to.. so it can feel very lonely. As a matter of fact, it’s extremely lonely but I feel like I would prefer it that way than be surrounded by “fakeness”? That may not be the right term but I wonder if there are any other moms who feel like this or is it just me? I really hope not!