Black Heart Inertia - Story Statistics

What if you turned out to be not you but someone else entirely? What if you were created and not born? How would you feel? Would you consider yourself real or a replacement? And if you are a replacement, are you just as good as the original? Can you surpass him or will people damn you for it, will they accept you as your own person or will you still only be a replacement, a replica. Would you regret being created?