Your suggestion that women are unmarried because they can't find anyone to marry them is not very nice to all unmarried women. Has it occurred to you that not everyone aspires to be married?
Women are supposed to aspire to be married though. There are women who plan their weddings long before they find their husband to be, and young girls practicing writing Mrs. X...
Weddings wouldn’t be such a huge industry if women weren’t driving it. “Special day”, “once in a lifetime” etc, it’s made to be some huge event centres on how special the bride is for getting married.
Men, on the other hand, are expected to avoid it for as long as possible, in the end having to choose between splitting, or marriage, giving in with a wry shrug.
Lets face it, getting married is a big thing for women, and you’re seen as “less than” if you don’t, whether it’s a choice or not.
Mrs still does confer a social status, which is why women choose it and are “proud” to use it.