Some people are hard to kill.
I myself have been stabbed, shot, fallen off a cliff, beaten pretty badly, nearly pulled off a boat on the open alaskan ocean, fallen though ice, nearly died of pneumonia and so on.
What's keeping me here? I'm a survivor and hard to kill. Nothing particularly supernatural, perhaps outside of destiny.
Take pride. Plenty of people are easy to kill. And you're not one of those people.