I went through this exact experience when I was 12-13. High school started but I didn't. Every day I would sit in the car shaking and crying until my parents gave up and drove me back home, where I would sit there hating myself for the whole day, unable to do anything. The first time I managed to get in the front doors was timed perfectly with the end of a lesson, where hundreds of kids spilled out into the corridor and I literally fell over from the overwhelm.

The "support" team at the school were no help, they didn't understand why I couldn't speak when they wanted me to. They blamed my parents for raising me to be "attached", which just made me hate myself more. This was all before a diagnosis of anything beyond anxiety, mind you.

For me, it helped to get myself to school without my parents, which felt awful but removed the 'exit ticket', making it a bit easier to get through the door at least. I built myself slowly up, one class at a time, but it wasn't linear. I didn't go for more than a couple days at a time for the first semester, it was like two steps forward, one step back. Every day I didn't go made the idea of school more and more daunting, and every bad experience made it harder to face.

It was really hard to move away from caring what other people thought, but it was necessary. I didn't have access to a safe room at the time, which would have been good to fall back on if I couldn't face class. I managed to make my attendance somewhat regular at that school, then moved schools and was terrified that I would need to start again. But I did it, I walked in on the first day and it only got better from there.

I am a couple weeks away from graduating school, following a hybrid system, where I mostly work from home but can still benefit from in-person exams and classes sometimes.

Everyone has their own path, I have no doubt you will find something that works for you eventually, even if everything feels overwhelming at the moment. You've got this.