Why would people act surprised when they find out I’m single?

Anonymous
I’m 25 years young, I haven’t found Mr Right yet. When I mention I’m single, I get asked why a lot. Is it a weird thing to still be single at 25? A lot of my friends are already married or are in serious relationship. That doesn’t bother me at all, but sometimes I feel like people think it’s strange that I’m still single, never been married or have kids.
Why would people act surprised when they find out I’m single?
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