jemima
there is a lot you can do to prepare for birth
make sure you find and book in for antenatal classes, or some sort of birth preparation..many doulas offer one to one birth preparation and can be there to support you during labour and delivery too...
also, read ! and read and read and read...books and articles that normalise birth , and an normalise pregnancy rather than make it a medical procedure to be feared
it is painful but there are a myriad of different ways to deal with the pain, and it is positive pain, with a baby at the end of it!!
Ina May Gaskin, Janet Balaskas, Michel Odent,Penny Simkin and Sheila Kitzinger, amongst others all write about normal birth
Hypnobirthing is also meant to be very useful for dealing with labour and there are teachers all over the country
if you have a genuine phobia of birth, (tokophobia, IIRC!) then you can get help with that before baby arrives
there are many positive steps you can take to make this a more enriching experience
good luck