Final answer:
The narrator avoids looking at their body primarily due to feelings of shame and discomfort associated with their gender identity, which are characteristic of the transgender experience.
Step-by-step explanation:
The narrator avoids looking at their body due to a deep sense of shame and discomfort with their physical self, which is often connected to the transgender experience. As the provided text indicates, transgender individuals may feel disconnected, viewing parts of their body with disdain and feeling like they are trapped in someone else's body, changes during puberty especially can intensify these feelings of self-hatred and body dysmorphia.
Therefore, out of the given options, the most fitting reason for the narrator's aversion to looking at their body is likely due to shame and immodesty, as it aligns with the sense of body-related shame described in the context. This emotional turmoil can be so intense that avoiding their own reflection is a coping mechanism to manage the distress associated with their body not aligning with their gender identity.