Is it normal that i'm unusually resistant to pain?

Over the years, i've been in many accidents, some more fatal than others, and had several injuries, yet i've realised that I never really the pain that comes alot with it. For example, during a rounders game, I collided head on with the largest guy in the team and we both went flying and he was weeping with pain, but I (who was alot smaller) just stood up and shrugged it off. Another example is when I got "dead-legged"; yes i still felt it but i wasn't showing any reaction and again just dismissed it, whereas others could barely tolerate it. Also, when i was slapped with a stick on the wrist by my crazy friends, it left a few marks on my hands and neck where I was hit and still let them to do it cause it was fun for them and I didn't mind. I was also bitten by my dog once to an extent it made it bleed but i still brushed it off and carried on, and when i was stabbed with a bunch of needles, they got stuck in my skin (not so deep) and i bled a little but I didn't even feel it pierce the skin. Is this normal cause I'm starting to think i'm invincible lol