Sweet, although to a certain extent you can't control exactly what your body does in labour (although there are heaps of things you can do to help it do what it's going to do naturally), but you can control how you respond to your body.
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Great way of putting it Suse

Hun, don't let your FEAR take over..... please read as much as you possibly can about labour and birth and what happens to the body when it happens etc. Keep reminding yourself that women have been birthing for thousands of years and it's totally natural, normal and exciting Read as much as you can about your condition you have so you are best equipped with knowledge.

Remember, knowledge is power

I had an amazing natural birth and I really honestly believe it was partly (mostly) because I went in with NO fear of the birthing process whatsoever and I trusted my body, it knew what to do.... I went with my body. I accepted the inevitable, accepted that yes there would be pain but GOOD pain... pain with purpose I also had a very supportive DH who I educated about the birthing process and my rights etc and we read things together.... I helped prepare him for what was to happen and what I would need him to do for me during the whole thing... he was amazing. If you don't feel you have a supportive partner to bring in with you, perhaps a Doula would be wonderful?
I also went in knowing that I could not control every part of the birthing process, only some parts of it and that nature would do the rest..... your MIND you can control.