Funnily enough, I'm close to the exact opposite, OP.
Personally, even when I was a child, death never really scared me. Why should I be afraid of "nonexistence"? I'll never experience it, because I'll be dead and not capable of experiencing it.
This perspective of "it won't matter when I'm dead" has been compared to that one bomb defusal quote. "I'm either right, and it's suddenly not my problem anymore".
This perspective on life has gifted me with what is essentially a fearlessness in almost any situation. If it has the possibility of killing me relatively quickly, there's no reason to be afraid. Walking a tight rope? Being threatened with a gun? What happens when I'm dead won't matter to me because I won't be around to see it.
What I'm truly afraid of, consequently, is dying a slow, painful death. Either that, or being completely crippled. If the death is quick it won't matter, but if the path there is long, drawn out, and bloody, then it will matter. No reason to fear something that won't affect you in the slightest.
I have nothing to lose, yeah, but even if I did have shit to lose-- it won't matter when I'm dead, and my philosophy is complicated by the introduction of religion.
Though, my wager is pic related, and that's a conversation for another day