I would say that it's hard to get your head around how this thing is going to come out of you when you're in a normal state of mind. Birth may be natural, but it is sooo not normal. It feels surreal, almost like you're on drugs. Your body and mind are in an enhanced state. I had augmentation in labour with DD, but even then the ctx didn't feel anything like what I expected. I just had gas, no epi, no cuts, tears or grazes. You will be ok. the process will take over and you will go with it. At the end of it you'll have your beautiful baby. GL!