Wow! How negative is that? For me there is so much more ( and less) I got married, discovered I was infertile = no family. But so? I love my life. I continue to study. I have extended family that want me in their life. I have a happy marriage.
I don't really see the Original Poster's analysis as "negative" so much as an accurate description of what we are sold, as a society, to being what life is all about!
If you think about it, this is what we are told from the moment we can understand, that is in store for us, and the reason why we have to go through the education system. We are all placed on a conveyor belt from the moment we are born. Headed towards a prescribed series of events. That's not negative, that's reality.
The original poster isn't saying they don't love their life because of it, just that everything seems so neatly sorted out for us before we've even finished school. I've often felt the exact same way and can see clearly the way everything is set out for us so we don't feel like we have any other choice but to follow suit...because everyone else is doing it. Go to school, go to uni, get a degree, to get a "good job", get married, have babies, then die. It's pretty much what we do isn't it?
I saw nothing negative in what was said, and many people find that life to be satisfying. They also don't ever consider that they don't necessarily HAVE to do things that way, because it's just what is considered 'normal', and everyone around them is doing it, so they do too.
Not everyone has to get married or have kids. It doesn't mean they can't have an equally happy life, and nor does it mean that because a person does live that prescribed life, that they must not be happy. It does mean that many people don't necessarily know why they are getting married, having kids and working in a dumb job they hate though...they're just doing it because that's what they have been programmed to do.