I completely undersdtand your perspective - but sadly, we live in a child-oriented society - superficially at least.
As a step-parent of two daughters, I was always being asked if i wanted 'one of my own ...' and I used to reply, "What do you think my other two daughters are? House guests?"
My wife and I went on to have a third daughter, and I treat them and love them all the same, and would take strong issue with anyone who tried to say one was different from the other two in that sense.
So, I understand who people love to try and get you to 'conform', and you simply have to ride it out and be yourself, and be happy with your life, which is your right.
For the record - when you have aq child of your own, it's bodily functions do not phase you in the slightest - nature builds in a method whereby you can deal with the 'unpleasant' aspects of babies and children quite naturally, but that simply does not apply to other people's children - so it's perfectly fine that you are not enamoured with the daily 'routines' that go with parenthood.
It's clear that motherhood is not for you, and yes, you may change your mind, which is certainly not the same as saying that you WILL change your mind.
You are an individual - and more power to you - tell the 'conformists' to swivel and walk away.