Although the song is seemed to be in the point of a girl. It is rumored to be Gerard and his experience of crossdressing, not only that he also came out about being more feminine and dressing as a female once. Hence the line “‘Cause I’m not that kind of girl”.

“ In 2014, Way began openly discussing his gender identity struggles online and in interviews. In a Reddit AMA hosted by Way in October 2014, he stated, "I have always been extremely sensitive to those that have gender identity issues as I feel like I have gone through it as well, if even on a smaller scale. I have always identified a fair amount with the female gender, and began at a certain point in MCR to express this through my look and performance style. So it’s no surprise that all of my inspirations and style influences were pushing gender boundaries. Freddy [sic] Mercury, Bowie, Iggy, early glam, T-Rex. Masculinity to me has always made me feel like it wasn’t right for me”.

But this song could just be about a girl crossdressing and being bisexual.