Exactly, all we can do is make a person's body appear more masculine or more feminine, that's it. We can't for example, make the person's body start naturally producing hormones that drive male or female sexual development. It is fair to say, therefore, that a man cannot become a woman and vice versa. They can only appear more masculine or more feminine, often at the cost of lifetime drug regimens and multiple surgeries.You're the one imagining you know better than the college educated professionals.
No one is suggesting you can change your chromosomes or DNA.
And in all seriousness, if a man can become a real woman, a miracle occurs, because we've been told that sexual identity is immutable and can never be changed. Therefore, if a heterosexual man becomes a woman who then is attracted to women, he has transitioned from straight male to homosexual female. Isn't that amazing?