I was also healthy, fit and having a straightforward pregnancy. Then I got gestational diabetes which quickly became uncontrollable except with insulin.
This meant that I was induced on my due date. At this stage I still hoped to have a natural birth - I had been out in the bush a week or so earlier and had said to DH "I would love to just labour here, under the stars with nature all around me, imagine how magical it would be bringing a child into the world out here"
Well, 6 hours into a labour consisting of constant, back to back contractions, when I had dilated 1 bloody cm, with my precious DS's heart rate decelerating with each contraction, as soon as my obstetrician mentioned the word c-section, I almost bit her hand off (except that would be weird as then she wouldn't have a hand which would have made doing the c-section a bit tricky).
THe c-section was the best bit! Very quick, painless, no drama. DS delivered onto my chest.
And now 2 years later, I basically never think about how he came into the world, although I do sometimes stop and think how lucky I am to live in a country with access to superb medical care which means that my wonderful boy is actually here.
So basically, it's lovely to plan for a natural birth, but once it's all over, if you're a bit calm about how it's all going to happen, you probably won't think about it much once it's done - but if you do attach a lot of importance to the event of birthing the baby, and then it's not how you imagined, you probably will feel a bit sad and let down. But it really doesn't matter how they come out, as long as they and you are healthy at the end of it.