A big reason that drove me was that I have a micropenis.

Fake. There are no "reasons to drive someone" other than their internal gender, this sounds like something ~~a cis person~~ someone who thinks being trans is a choice would say.

Edit: For clarity, I'm not speculating on whether or not the OP in the post is trans or cis, I'm saying it doesn't sound like a real story because it sounds inauthentic to the trans experience. A trans person could easily think this up, like anyone can make up a story that is close to their experiences, but since it isn't real it doesn't really pass scrutiny.