Try not to get worked up,I know how scary it is. I had emergency section with my ds, very bad, we both nearly went, but with my dd 10 yrs later I was all for a normal birth, but hey ho, It wasnt to be, I had a cs, but I requested it after my labour etc went the same way, I could see it all before me and that was why I had 2nd cs.
My point to you and other mums that think and feel the same is this, if you are scared, frightened, you wont labour properly, and if you dont labour properly then thats when the trouble starts.
Its a long way off, but if you calmly and reasonably speak to your midwife and consultant about your fears, they will take note and mange you through the pregnancy, speak with them about it when you see them, let them know that for you it is an option you want to have, you have to enjoy your pregnancy, dont let this ruin it for you.
Eventually this baby will come out one way or another, and they will want it to be the safest way for you and your dc, they will understand, give them the chance to listen and they will take on board everything you say and feel and come to the same conclusionas you, they are more than white coats, they have children too so will understand how you feel.
Good luck,