Majoru Oakheart
Adventurer
Hp is a measure of how cool you are at not dieing, same as other defenses.
Yeah, this is my philosophy behind it as well. My characters KNOW they are that cool. They've stood up to giants with clubs bigger than they are and survived when they just narrowly missed due to extreme luck(they did damage, but never killed him). He's had fireballs thrown at him and barely ducked at the last second(taking damage but not dying).
All my characters know that they have the skill and luck to survive things that would for sure kill normal people. They might not know the EXACT amount of hitpoints they have. They do know approximately the amount of damage things do in comparison to their hitpoints.