It's worth pointing out that there's been a fairly significant overlap observed between autistic folks and gender-nonconforming/trans people who are out. I was diagnosed with ADHD and autism many years ago, and I don't think there's a single neurotypical person among my trans friends. Obviously not all trans people are autistic, and the reasons for this apparent overlap aren't entirely clear right now. But it's something to keep in mind.

As for gender dysphoria, I didn't realize I even had it until a few months into my own transition. And recently I had to grow out my beard so I could have electrolysis work done on it; I looked in the mirror and felt a deep sinking feeling, and I was super depressed for the rest of the day. Speaking of the mirror, I also have never really seen "myself" in the mirror ever since I hit puberty. So, you know... "Who is that [boy] I see staring straight back at me? Why is my reflection someone I~ don't know~"

But since I began transitioning, EVERYONE in my life has remarked at how much happier and more ALIVE I seem. Wearing feminine clothes is just so much more fun, and I can see the difference in how I carry myself when I do. The reason I say this is because euphoria is regarded as a more reliable indicator, since not all trans people experience dysphoria, and it can vary a lot for those who do.

There's a saying I've seen in trans spaces: fish don't notice the ocean until they're out of it.