Don’t be scared OP, it’s something your body can do.
I haven’t got a particularly high pain threshold, but I had both of my DS fine, I didn’t even have gas & air, I would recommend drinking raspberry leaf tea a couple of weeks before baby is due, and hiring a tens machine.
Every labour is different, I found it bearable. I went into labour the contractions built, contractions are painful, like really tight squeezing, I wouldn’t have been able to talk through mine, but they do come and go, they get a lot faster as baby is about to be born. Yes it does burn as they head crowns, but once the head is out the body pushes out easily.
It’s totally awesome, so many women give birth many times, it’s just a short period of time and when you have you baby it is a feeling you just can not describe. I genuinely wouldn’t fear giving birth if I had to do it again. And it is something you forget.
You will be fine OP, try not to think about it and don’t listen to horror stories, it’s so unfair when you are worrying anyway. Good luck.