Why are people shocked when I say I never wanted kids and now I never want to get married?

I am 37 years old and am now single again. I never wanted kids and I new that really early on in life. Why are people shocked when I say I never wanted kids? Now I am pretty sure I never want to get married either and that too makes people shocked why? I have been in a few different serious relationships and they seemed to end badly. Life is hard enough and I am leaning towards just focusing on my career and staying fit. I don't see anything wrong with that. Over 50% of marriages fail anyways so really what is the point?
Why are people shocked when I say I never wanted kids and now I never want to get married?
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