People love to criticize larger (but not outrageously-sized) houses. IME it’s been either thinly-disguised jealousy or a “yuppies suck” attitude.
The people I work with generally have houses ranging from 1500 to 3500 square feet. Mine is on the low-end of that range, about 1800 with an additional 600 or so for the basement and 400 or so for attached garage. When I lived alone, my family bitched about having extra bedrooms that were unused:
“What are you going to do with them?” (whatever I want. One will be the bedroom, one the den, one the lesbian pleasure palace of exquisite perversions,…)
“A house that large needs children to fill it up.” (ummm…no, it doesn’t, actually. Saying doesn’t make it so.)
“Won’t that be so much cleaning?” (um…no, not unless I’m a pig)
“Won’t that cost a lot to heat and cool?” (not if I shut the vents and doors in the rooms I don’t use. It’s not that hard. Plus our energy rates in the US are laughably underpriced as it is.)
“I don’t know, I’d think it would feel too empty.” (like one poster in this thread already said, I’d be happy living in the spaces at Versailles if I could. I’d love to have more space, and if I finish the full loft I have, I’ll have about 1000 more square feet of space. And that won’t be enough either, but I can’t really move right now.)
I can’t feel bad about my house, sorry, and it sounds like the OP should not feel bad in the least about wanting more space. Remember - you can always use less space than you have, you can’t use more space than you have. Nor do I begrudge anyone wanting a larger (or smaller, for that matter) house. I can exist and live in small places, but that doesn’t mean I have to like it.