Who am I?

i was going through an article on self realisation today & the words in bold, kind of induced deja vue.."who am i"? the page said.... it made me nostalgic with sleepless nights during which pondering over this question was a good idea...flashes of the old probabilities coupled with new inquiries minus value additions accompanied me till a priority rationale made its way..it goes like...who am i? the one that i know? the one that the world knows? or the one that god knows? am i here for a purpose? i can sense so many of them, which one exactly? or all of them? all of them possible if i die tomorrow? why the heck do i need these answers? will they make a difference? may be..may be not...& another quest goes unanswered...i shooed away the thought resolving its a pointless investment & at the same time knowing somewhere deep that it'd return to my phasual idleness with ..additives!!