I don’t believe for a minute that many women were born never to have a zivug.
That would be just plain cruel, and the borei olam isn’t cruel.
I think some people might push away options because of personal growth that they have to do. Even then, I don’t believe all is lost. I’ve seen women of all ages get married and make really happy marriages, focusing on trying to find one’s zivug is futile. It’s a distraction and I don’t think we’re meant to ask ourselves “is this my bashert”? I think we just have to look for someone that we can grow with who’s ideas are not so foreign from ours that it would cause daily conflict. Once you’re married, I don’t think you care if you married your zivug, you just want to be happy,doesn’t the Torah say that Leah imeinu was meant to marry eisav and that she davened for mercy and she was given to yaakov? A bashert doesn’t mean that they’re meant to be happy with them.