Another Me

I walked the plank
and then I sank
to the bottom of the sea
just to find another me.

Cupping my ear to the shell,
I hear not ocean, but Hell.
I'm hunting down the treasure chest,
for with this map I am obsessed.

I must find the happy ending,
but my ship I'm still defending.
I battle off myself each night
and either way, I win the fight.