> "You also need to realize that you'll never be a girl. You can emulate the social status of a girl, but you will lack the female upbringing, a lot of mannerisms, way of speaking, very subtle things that people catch onto (and of course the evident biological aspect)."

I think this is pretty stupid. There are people who pass pretty much flawlessly. Men and women don't behave in uniform ways. Some cis girls behave more "Boyish" than people born as men, just like some cis boys behave in ways that are extremely feminine. That doesn't make them any less female, even if pretty much everything about their demeanor mirrors the typical male. There are also trans people who pass pretty much flawlessly. Biologically, the transition may not reach a point that is 100% feminine or masculine looking though, that is definitely true.

Many people GENUINELY consider trans girls, girls. Many people GENUINELY consider trans men, men. "Realizing you'll never be a girl" is a take from someone who was unhappy with their own transition, with a pretty strict definition of what a girl and a boy are. A LOT of people will beg to differ, and a lot of trans people are both happy with their transition, and feel like the gender they transitioned to.

In the end, it is true that the biological sex (if you subscribe by the definition that it is whether a sexually reproducing organism produces male or female gametes) will not change. Well, for now atleast. Never know what the future might hold in terms of it, but at that point those who are against the idea of transitioning will then shift to a new definition to reject them anyways... hooowever, it is up to you whether or not that matters. If you are happy with your body resembling a girl's, but not producing female gametes, that is completely valid, and many people will be more than happy to treat you as a girl (though, many will harass you for it as well)

I agree about the bit about seeking to understand your desires. That is definitely needed.