I think the fact that medicines scare me worse than pain is a factor. LOL. I may have shouted some profanity from the rooftops during that time. Also,m the pain isn't constant, it only hits during contractions. Once the pushing phase starts the pain is a lot less, until the baby emerges.
I have heard that gallbladder and kidney stones are some of the worst pain you can have aside from say, breaking a hip. At least during labor you know the cause and that there are ways to relieve the pain.