OP, do not worry.
My 1st birth was the usual, painful, but only to be expected.
I 'thought' that 2nd birth would be quicker and less painful. She was bact to back. Let's just say, that if I had had a gun, I would have shot myself. It was horrific.
Afterwards, for about 3 months, everytime I saw an obviously pregnant woman, all the hairs on the back of my neck stood up and I came out in a cold sweat.
However, when I found out I was pregnant when DC2 was 6 months old, I rationalised that it would be fine. Every birth is different, and just because you have one bad experience, does not mean that all will be bad.
Birth 3 was run of the mill, and I was actually really calm and laid back about it. I was actually in labour for most of the day but carried on ironing, had a shower, watched some TV, before going to hospital. Once there it all happened within the space of an hour.
Don't get hung up on past births, each one is toatally different.