I’m autistic. In my early teens I presented in a way that could be described as masculine. I gave no shits about women’s fashion or makeup or nail varnish etc. I wore loose tshirt, jeans and boots pretty much all the time, with a baggy mens jacket. I also wore a tight vest which flattened my breasts. My interests were typically masculine.
Thankfully it was the 90s so nobody suggested I was trans. I can tell you exactly why I dressed like that - to be invisible.
I was completely unable to navigate puberty. People had begun to comment on my breasts growing and I found it upsetting and embarrassing. Sexual harassment from boys was a constant problem, and due to my communication difficulties I was unable to handle flirting. I also found that the boys who shared my interests were starting to exclude me as my femaleness became more obvious. So I hid my female body as much as I could.
As I got older, other girls increasingly shunned me. Girls are much worse for excluding girls with autism than boys are for excluding boys with autism. I had no friends and I was constantly bullied, and I didn’t know why.
At the time I would have latched onto any explanation for the way I was being treated. I would have grabbed any solution that would make the bullying and harassment stop and allow me to have friends. So if I’d been told I was trans, “and that’s why girls don’t want to be your friend, and that’s why you’re not interested in flirting with boys, and that’s why you have male interests”, then I’d have accepted that as the answer. And if I was also told “if you’re trans then the boys who share your interests will be friends with you and the bullying and harassment will stop” - I’d have leapt on that as a way to have friends.
But it was the 90s. So I was just bullied and isolated for a number of years, and tried to kill myself several times. My body grew and I learned to cope with harassment and embarrassment. In fact I learned that my body was a tool that I could use to get friends - because if I let boys have sex with me they would be my friends.
It’s a long and sad story. Suffice to say I’m now in my 40s with kids and clearly not trans. But I completely understand why teens in the same situation grab onto that as an answer and solution to their problems.