My birth experience was great. Not straightforward, and a bit more medical than I wanted, but great. Left me feeling like "This was hard but I did well!!".
Then noone asked me about it, and my life was taken over by a baby who wouldn't eat, and I didn't sleep for the next 3 nights, and the general madness of a growing little human took over.
The point is, those days are not honestly talked about. Ever. Not among friends, not in the movies, not in the popular culture. I had an incredibly intense experience, and never had a chance to properly debrief. The birth is still "women's thingie" that is best done behind closed doors.
I can totally see myself getting drunk and using any pregnant first time mum nearby for my own therapy. Simply, noone else can be forced to listen.
What I'm saying is, these women are not talking about your birth, they are talking about theirs. It's incredibly annoying for you, particularly if you're already nervous about it. Try not to let it get to you. There is a number of great births out there, and most women go on to do it again. There is a website somewhere collecting positive birth stories - perhaps reading those might help as well.
Either way good luck. You'll do great!