A couple of people have mentioned the pressure on women to get married and have kids - whoa yeah, that's definitely still around. It was what my mother was taught, and what she taught me.
I was supposed to grow up, go to college - not to get an education, but to meet The Right Guy(tm), marry him, be a virgin when I married, start having lots of babies, and be a stay-at-home mom. That was the life I was taught I should live and be fulfilled by.
I don't doubt for a moment that there are definitely women (maybe men too, who knows) out there who would be and are fulfilled by that life. My mother was certainly one, and I have a cousin who is very happy doing the same. I wouldn't begrudge them that for a moment, nor ever imply that it's some kind of inferior or "wrong" way to live.
But I will admit that somehow or other, I realized somewhere along the line that as an individual I'd find that kind of life stifling and ingenuine. It wouldn't make me happy, and it wouldn't do any children in that situation any good either, because in the end they'd be fundamentally unwanted. Plus I'd be a crappy parent, frankly. There are a lot of reasons, really.
Boy, I tellya though, the familial pressure to conform to a certain kind of family model for myself - conform and be satisfied with it - was tremendous. When I married the first time, still trying to live out The Plan(tm), my own dear grandmother came to me shortly after the wedding and said, "Now M----, no pressure - but I want to be a great-grandmother." Yikes!
Fortunately my cousin just complied recently, and had a healthy baby boy.

My granny is happy to be a great-granny, and the whole family is pleased to have a little squirt to dote on... and then give back at the end of the day.
Incidentally, something odd - when I finally realized in my late 20's that I didn't actually want children, and I went public about it, my mother relaxed and admitted she didn't want to be a grandmother either. Which I found kind of odd. Sometimes I wonder if my admitting I didn't want kids maybe allowed her to give herself "permission" to admit she didn't really think that I had to have them, or didn't want to be a grandma, or whatever... I'll have to ask her about that some more later. (Maybe everybody just grew up and mellowed out a bit, who knows.)
Anyhoo. Just some more ramblings on kids, parenting, choosing to have kids or not, and stuff like that... thanks for reading.