Actually im re-reading it and im now sure im wrong, its just too good of a riddleand maybe the answer will come to me when im not thinking about it lol. i just can't put my finger on it, one part agrees and another part contradicts my guess so im pretty lost and steadily loosing confidence.
I think it's Our/your/a persons personality, i was originally thinking things like our skin, LOVE, our back bone (don't ask why) and the weight of the world on our shoulders. How'd I do? =]