Why does society shun single women?

Not every woman wants a husband, kids, or marriage- I find I'm happier single than tied to someone plus I don't want to share my time, energy, or anything with anyone else. I don't need relationships to be happy or look for validation through another human being.
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Because society says the only way for you to be happy is you're married and have kids- I disagree- happiness is something you obtain on your own.
Why does society shun single women?
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