It's supposed to make you if that makes any sense. Its the blue print of your body. You get everything from the color of your eyes to the person you're attracted to from it. It makes up all of your cells and everything. Without it you couldn't exist.
BECAUSE JESUS SAID SOOOO!!!!!! No, just kidding. Actually because it is a deoxyribonucleic acid, a self-replicating material present in nearly all living organisms as the main constituent of chromosomes. It's also the carrier of genetic information. :D hope this helped.