Well, first of all there'd be the panic as to having to go through school and worse puberty all over again.
There would be the joy at a chance of having a do-over if you were unhappy with how things worked out.
Then there would be the horrified realization that you have a do-over and everything you worked for up to that point was erased.

Thanks a lot

I'd imagine that I would keel over from an aneurysm or some other sudden cerebral breakdown, since knowledge and experience form neural paths that take time to develop, and all of a sudden having decades of them injected all at once in a still developing brain would stress to the point of snapping.

Thanks for the GA though =)

Gracias

Thanks ;)

Thats actually a plot line for an anime "Erased" (or Boku dake ga Inai Machi if you prefer japanese names). Suprisingly, it doesn't go as well as some would think it should.