I didn't everyone is born that way, I did make a choice to become Asexual after sex horrified me too much, although that being said I do still very much consider myself to be part of the Heterosexual group since I am still romantically attracted to the opposite sex, so I still never diverged from my natural path I just decided that I wasn't interested in sex itself, I very much consider myself to be a Hetero-asexual.