First Reaction Is to Discourage

When others have asked me what my goal is for the birth of my son and my response is a natural, un-medicated delivery, (unless my sons life is threatened in any way) WHY is their first reaction to give me funny looks and discourage my decision? Like it really irritates the crap out of me. Why can't you just be an adult and respond with something like, "Wow. That's awesome!", "I hope everything goes great for you". I just don't understand I guess. Like literally almost EVERYONE has been discouraging and say stuff like "Yeah right, you'll change your mind real quick" Or they'll laugh and say "No no no, you'll want those pain meds". Or my personal favorite "You don't know what you're talking about". What happened to support, encouragement, positive vibes? It really just pisses me off!!!