http://ftp.iza.org/dp4200.pdf

By many objective measures the lives of women in the United States have improved over the past 35 years, yet we show that measures of subjective well-being indicate that women’s happiness has declined both absolutely and relative to men. The paradox of women’s declining relative well-being is found across various datasets, measures of subjective well-being, and is pervasive across demographic groups and industrialized countries. Relative declines in female happiness have eroded a gender gap in happiness in which women in the 1970s typically reported higher subjective well-being than did men. These declines have continued and a new gender gap is emerging - one with higher subjective well-being for men.

Their reasoning why this is a paradox at all is flawed, because it's presupposition is wrong, that feminism was a net good for women overall. It's only a net good on balance for the top 20% of cognitively elite women who had so much untapped productive potential as stay at home moms that it drove them nuts watching men enjoy all the glory in our hugely successful economy. This obsession over a phantom wage gap between us is illustrative of not the underlying cause of the lack of happiness, but simply needing something to bitch about quite literally to compensate for their underlying depression, like an alcoholic does by drinking their pain away.

Unless you can afford a foreigner to clean your house, babysit your children, etc, there has never been more pressure on the bottom 80% of income earning women in Western society. As women have flooded into the economy to compete with men for limited middle class jobs capable of supporting a family they have devalued workers themselves to a large extent. A college degree used to mean something, now it's just a pre-recquesite for HR departments to consider your application. So demand for graduate degrees has never been higher, further pushing out the time when women feel ready to get married and financially secure enough to have kids.

Because they often earn more than the median male does they are dissatisfied with the potential set of men available to them (basic hypergamy that's been proven as valid over and over again). A woman values a man's potential to provide 1000 times more than a man values a woman's providing capacity. College graduates are close to 60% women and have been for quite a while, and they all desire a college educated man. Simply due to mathematics alone 33% of them will not find that person because they don't exist in our modern world.

So they are left fighting over the limited number of men who dominate in STEM degrees, but only once they hit 27-32 years old and their biological clock starts ticking. Before that they could care less about such men to a large degree, because they are not masculine enough to trigger natural tingles that developed in an era where brain power was not in high demand, mainly physical strength, health, and potential to protect and hunt.

https://www.ehbonline.org/article/S1090-5138(17)30315-X/fulltext