Severe writing anxiety

I wasnt going to post here at first but it's worth a shot? I used to write all the time when I was younger, to the point I'd write small stories for fun but once I hit like 4th grade I started I guess rebelling against writing? we had a state writing test that we were obligated to do and I didn't want to do it so I slept through the entire thing. At the time I don't think I understood why I didn't like writing? but as I got older I realized it made me extremely nervous and it's slowly been getting worse. it's to the point that if I feel pressured to write it's like my brain goes blank, I can't breathe, my mind starts racing and I completely break down. My reading comprehension is really high so everyone assumes I can write really well too and I'm always told im just not trying hard enough or I'm being stubborn but that's not what it is at all? nobody understamds it because I'm the only person they've met with bad writing anxiety and as much as i try to explain it to people, no one really understands. I just feel so alone.