@Madnacc
I refer to the relevant entry on "egg" from Urban Dictionary:
"A trans person who hasn't awakened to knowing that they are a trans person yet
When I was an egg, I loved playing as female characters in games and it made me happy to be called a she in my guild."
In this case, the main character's excuses to themself about picking a female character is basically a trope within the MtF egg/trans community as a very common reflection of eggness. (Yes, there is something like an egg community even though self-identifying as an egg basically means you've already "hatched"). Of course, the reasons the main character gives are valid in-and-of-themselves and don't make somebody an egg, but they are also very common "excuses" made by eggs to describe their actions without acknowledging their underlying gender insecurity. Which is why I made the joke. Which I have spent probably too much time explaining now.