It's tricky, for a straight woman - when to 'man up'.
This will not be everyone's experience, but I have seen it in so many other young women lives: I was in my first proper adult relationship where I lived with the man and shared bills etc from around 22 to 26. It's was a very wobbly on/off type of thing from 26 until I was around 27. I was well aware in those last few months of the relationship or first few months of being single, however one looks at it, that the last 5 years had me consulting with him on everything - where should we holiday, which job is good for me, where should we live, what should we do this weekend, what should we eat for dinner etc etc, big life decisions, small everyday decisions. Upon being single I rediscovered the exercise of being able to think through all of these decisions on my own, for myself, with no one else's voice coming in, contributing, changing the course of my thoughts. That period was so valuable. I rediscovered my own mind. I discovered me, who I was at an adult woman. I hadn't really connected with her fully since before my relationship, and then I was a teenager, really.
Now, I have friends who began relationships around this time, in the first few years after uni, who then married these men and had children with them and by large things seem to be as normal, ups and downs, but we're all getting there, wherever that is. BUT these female friends of mine, how to say it, it's like their minds are dependent on that of their partners. Or, ok, be kinder Jamdown, they are interdependent. All of their life choices have been made with their men in mind, never really what is solely best for them. I know this is just the nature of relationships and there is a beauty in that, but that is practically all of their adult lives. And as children have come in etc I have seen the men in their lives become more dominant in their conversations in a way that those friends of mine, and myself, are not experiencing. Not yet, anyway.
The advice I plan to give my daughters is to let go of any relationship they might have in their 20s that just seems HARD (I'm not saying they should jack in perfectly good relationships for nothing). Not to be scared to let it go because of a biological clock, or because other people are getting married at 28/29, or the good men all seem to be snapped up so they'd better hold on to their's, because for me the late 20's / early 30's was like a second puberty in that my mind expanded so much, I changed and grew and developed so much, it was great to do that autonomously, or at least with a wider range of influences than I would have benefited from if I'd been spending the majority of my time with one person who had a huge say in every aspect of my life.
There is so much change going on up until 30 ish, that I think marriage before then is very very young for a lot of people, women included.