I am reading the book TRANS: Exploring Gender Identity and Gender Dysphoria: A Guide for Everyone (including professionals)
There are very useful introductory chapters by Dr Az Hakeem
There are also essays by a number of people with different perspectives. One of these is a transman Luka Griffen who set legal precedent in Australia:
In his essay Luka describes the discomfort felt as a young person and then as a teenager during puberty and the associated physical changes
Luka identifies the internet and YouTube specifically as been how he made sense of his feelings. referring to
‘How I knew I was trans’ , ‘Quiz: are you trans?’ and a YouTube video called,‘ How I knew I was transgender (and some advice on coming out)’ by Skylar Kergil which Luka describes as resonating completely with all of his feelings.
Luka describes a moment of epiphany,
"I felt so much relief. Because somebody actually knew how I was feeling, it helped give me a new understanding of myself. Some of the confusion, frustration, and anxiety was easier to deal with, just knowing there were other people in the world who felt like me. It was like a light had been turned on in my mind. I knew I was a transgender man, and I knew that I didn’t want to be called by my birth name."
Having read this essay, I searched YouTube 'Am I transgender?'.
Many of the top rated videos are by young transmen. I watched a few and was struck by how many said, 'If you're asking the question, you probably are'
There are also a great many similarities in these young people's YouTube narratives and advice including 'try out the pronouns and see what happens'. This may primarily be about how the young person feels but would also include the response that they got from the request / requirement of others.
Presumably a follow-up by many might be 'my friends / school / family' won't use my preferred pronoun what should I do?'
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The book was mentioned on the thread & I recommend it (profits are for a MH charity):
www.mumsnet.com/Talk/womens_rights/3303573-This-is-what-the-Portman-Clinic-had-to-say-about-Gender-Transition-in-2002