Gray Fox- Just a not, but adrenaline and hormones, while contributing to excitement and emotional state, are still just chemicals (etc) in your body. They contribute to a whole lot more than simply what you would normally think about. Many times your body puts just a single area of itself into what we would call "shock" if the whole self went into it.
I'm not meaning to say that your mindset has nothing to do with this though, because (from my experience) I beleive that you can learn not to let pain bother you. I still feel it, but I know what is just "ouch, you stepped on my toe" and "ouch, I hurt my ankle." Pain is good- it tells you what areas of your body need help. Don't completely ignore it.