In my puberty I had a strong feeling of rather being a girl and this caused significant mental anguish and some self harm. If had known as much about transgender people back then as I do know I would have likely transitioned then.

Today I'm pretty okay with being a man. I still sometimes have problems with it but not in the same order of magnitude.

From these personal experiences I think it is plausible that more people transition because more people are aware of the possibility and knowing other trans people in their age. I have no idea how big that group is however.