In references to the "Misconceptions about being trans that kept you from realizing" thread from a few days ago, that I was too sick to focus on.
I think for me, the biggest misconception that I had (that wasn't even a misconception -- there was dead silence in my brain where any gender questioning SHOULD have been) was that trans men were born women but wanted to express masculinity instead.
And that they naturally would possess an inner knowing of this, what we try to label as "knew from a young age". Something that would make their desire to express masculinity different from the garden-variety "I hate living as a girl" that I assumed all female people felt in a patriarchal society. I believed that trans men would not only know they were different, but have an internal comprehension of how they were different, from being just a dissatisfied girl.
In my mind (unspokenly, as I literally did not ever consciously think about this, it was so assumed) there was a scale, with trans men on one side representing "whoops, they got sorted wrong, valid!" and on the other side were all the kinds of people who comprised "women and girls". Feminism had taught me that this group was extremely varied, from feminine people to butch tomboy lesbians, and that was okay.
What wasn't okay -- what hurt -- was that I personally felt in a liminal space between these two groups. Perpetually. For decades. Alone.