Your arm burned the water 

To me "burn resistance" means that it wouldn't have burned you as for it hurting give it a couple of hours, your body is still in "shock" in that area so it effectively numbs it but that doesn't last forever unfortunately...

@imreloadin but this always happens, i just have it on my mind whenever I burn myself lol

Be careful - don't harm yourself.

You should probably go see a neurologist as there is a difference between pain "tolerance" and just not feeling it. If your body is just not feeling pain after having boiling vegetable oil splash on you then that's a sign of some kind of nerve condition as either the pain signal is getting messed up on its way to your brain or there is something wrong with the nerves themselves that is making it so they aren't reacting to stimuli.

@imreloadin I feel normal pains and other sensations perfectly, but I dont feel burning pains ever anymore. Unless the burn is super bad.

That doesn't make any sense as things like getting burned and pricking your finger on a pin use the same pain receptors...like I said though I'd suggest seeing a doctor as that could be a symptom of a much larger issue.

If you often work with really hot stuff you can get some sort of resistance to heat which can be pretty useful.

Just be careful with heat because even though you can't feel it that doesn't mean it can't hurt you.

@Cyberspirit @imreloadin As a kid I used to do dumb stuff like place my hand on the stove just because it wasnt red anymore (It was a glass stove), I did that twice, the second time it was just my middle finger and the fingernail came off due to the heat. in all, I've burnt myself so many times that my body may just be ignoring the burning pain now. I have a few burn scars, most have faded though.