My new Fallout 4 prediction is that it will turn out you were an android the whole time, and Vault 111 is the underground location of the Institute. The contract you sign at the beginning probably gives them permission to turn you into a robot, and you probably die in the atomic blast that you see, but get recreated as an android 1000 years later and go out into the world. That's why they have that whole line about how "the institute finds you."

Pic semi related. That dude is at least partially robot.