I've been thinking about this recently and I am pretty adament that I do not want kids when I am older. I am pretty young, at the age of 21, but I can't see it ever being a possibility. For one thing, kids drive me nuts, especially when they always go out of their own way to be disobedient as exhibited in schools (people in my class always used to be disruptive when I was in school and it really peeved me off). The concept of potentially having to raise a child (if my future partner demands it) depresses me, because of the high level of commitment involved, the fact that it would give my life a more deterministic turn and my offspring taking over would be a further cynical reminder that my time on Earth is limited and finite. I can see raising a child a very financial and psychological drain on me as I am slightly autistic and experience moments of depression and anxiety, so raising a child would not benefit me in the slightest. I would want to be in complete control of my life and make sure I satisfy myself (by keeping fit, being in academia and playing music) and make sure I am stable rather than create a huge compromise in my life by meeting someone who desperately wants children (as most women seem to).
What annoys me even more, is that when I tell people I don't want kids (e.g. my parents, friends) they're like "You can't decide yet" or "The time will come when is right" but this annoys me because it implies that I'm being expected to have children or that my views simply aren't valid. Furthermore, I hate how there is generally a fair bit of pressure and expectation from society for people to have children, and to point it out when someone doesn't want them (similarly for settling down and getting married). It seems to imply that there is only one way to live.
I don't see what the fuss is about wanting to have kids and I think most people only have them because it's the "done thing" or because it is human nature to reproduce, so people just do it without fully thinking about why. I don't have a problem with what other people choose to do but I just can't see how it would benefit me, especially since many people my age are wanting to get engaged/married and have children and stuff, whereas I'm finishing my undergraduate degree next year and I barely feel like my life has even begun!