Hey angel_ofsin!
I don't know if I will be able to explain you the meaning of the song but I will try.
I think the person who talks in this song think about the death and realize he(she) didn't do what he(she) should (i don't know if this sentence mean something: s) "When my time comes, forget the wrong that I've done "
This person wants some people to remember her after her death "Help me leave behind some reasons to be missed "
I'm sorry I can't speak english very well so I don't know if you'll understand. I can't explain more: s