I've noticed that there are a lot of people, especially women, in our time, who throw up every imaginable self-perceived obstacle to getting married, in essence, "talking themselves out of it". I have to suspect that a lot of them, either deep down or not so deep down, just don't want to get married, or have made up their minds that they will not marry unless they find someone with an impossible degree of perfection or conformity to their preconceived notions. Many women pride themselves on "not settling", which is fine, they're free agents, no one has to marry, lifelong singlehood is not terribly disliked in Catholic circles, but the sad part is that they reach a certain age, no children, never will be children, self-sufficient and independent, but at the same time lonely and looking down the barrel of an old age with few people who even care that they exist.
But on the other hand, if a woman peers into a potential future as a wife and mother, and is committed to the moral law of marriage, she might well make the entirely rational decision that unhampered fecundity, having more children than she cares to contemplate having to raise and be responsible for, just isn't for her. She doesn't want a life that's going to be that difficult. Again, that's fine, she's a free agent, if one doesn't have the temperament for it, then maybe it's not the best choice. Indeed, I have a pet theory that many women went into the convent in pre-Vatican II years because they didn't want to face the prospect of a difficult life, with many children, and a marriage that could just as easily be an unhappy one as a happy one, and saw consecration to the service of Our Lord as an attractive prospect. I can already hear the "Novus Ordo Puritan" types blubbering, "no, that can't be, a vocation has to be pure, a vocation has to be absolutely uninfluenced by any motives that are less than perfect", but that's just another manifestation of the extremism that often arises in the fever swamps of the more "conservative" parts of Newchurch. Our Lord can perfectly well make His Will for us, and His vocation, apparent through even the imperfect aspects of our temperament and circuмstances.