Back in the day, I went to school for architecture. But the day I graduated, I was offered a job with a nice salary as a graphic designer, and never looked back. I used to want to work for a big company (I don't even know why now, blah), but now I'd much rather run my own business.
I didn't want kids either, and that hasn't changed in 20+ years (though I've thought about it, occasionally.......umm........still NO). Mostly because I'm too selfish, and I don't want my life to change that way. And scared too, especially of the teen years. I was not very well-behaved as a teenager, and I definitely not want to go through what I put my poor parents through. I try to make up for it now.
I'd like to take a second to ask some parents a favor here: Do not tell someone who does not want kids that they should have kids. Unless every one of you gives them a dollar.
I didn't want to get married, but that has changed, sort of. I actually WANT to marry my fiance; as to when/if it will really happen, who knows?