I thought this way when I was younger too. I think it's fairly natural unless you've been raised in a very untraditional environment. I used to say "I'm not going to get married until I'm 25!!"...the thought being of course, that 25 was sooooooooo old and I certainly would have done all the living I had to do by then, but this sounded so rebellious to me as I grew up with most of the people in my immediate orbit being married by age 22.
You grow out of it eventually as you go on with life, or you should - unless you want to be miserable because you didn't do so and so by so and so age.
I haven't seen anything on here that made me think people were putting UNDUE stress on it. Hell, it crossed my mind at age 15 that "shoot, I'm not going to be able to wear my monogrammed sweater when I get married." Things cross your mind and you have to remember that a lot of things that used to be solely internal end up on the internet these days.
