Its deff. About departing with a really difficult and terrible addiction, because you hit rock bottom, maybe not necessarily substance abuse it could be about a girl but thinking about it being an addiction to drugs or alcohol it seems very rational. You feel a need and desire for this inanimate thing that puts you in hell when all you feel is pleasure. "got nothing against you, and surely ill miss you" obviously an addict never fully recovers, and then Loved ones back home all crying 'cause they're already missing me
"I pray by the grace of God that there's somebody listening
Give me a chance to be that person I wanna be" symbolizes exactly how a family feels when dealing with an addict, they feel like they've already lost you when youre still alive, and everyone hopes and pray all will be well but there are no promises.