You might look up a brochure called "doh-transgender-experiences.pdf" . Only thing I would disagree with is page 7, where they state stress, instead many experience relief.
It states that being trans has biological connections, to do with development before birth which influences the sense of self.
Before birth, brain and body develop at different times.
It was found that there are differences in brains of men and women, triggered by certain substance levels.
So a mismatch between brain and body is possible. (In the brochure are further references to evidence... and its a spectrum...)
So its not a light hearted decision but how they feel, and there are many feeling this way.
Its nobodys fault, neither theirs nor that of their upbringing or the internet or whatever.
And it explains some of the feelings transgender people have.
Well its up to you what you say...
you might even ask a teacher you trust to give you a few minutes and give a small lecture to all people present.
You might present one or two pages and give a few words, five minutes might be enough.
It might give some people a feeling of understanding.
Well, another way would be to tell a few people... simply explaining in easy understandable terms...
Imo its a big difference if people belive its some kind of choice or if people understand its a feeling with biological backing.
Its imo much more socially acceptable, and it might help with self acceptance.
And there might be some lgbt club at your place, with other transgender people...
or support groups...
If you feel like it, please reach out...
there are helplines to listen and support...
you might call here for example:
glbthotline.org/hotline.html
they also have a chat
translifeline.org
And try to have some fun along the way...
(all within reason

)
hugs