I would change it so that I was not born at all.
If that doesn't work as a valid answer, then I guess I would change my parents so that they aren't literal subhumans. I was locked up home everyday until 11(save for school) and suffered hallucinations, had imaginary friends, constantly felt like somebody's watching me, etc. and lost all social ability because of their incompetence. Were it not for them I would have just been yet another normalfag though, so maybe it's best this way.