I'm scared I've officially become useless

Bw ADHD and CPTSD, I feel like I've officially become of non-functional.

I'm in med school now and I can't f*cking stay systematic and focused like...ever.

I've an exam tomorrow that I haven't even started studying for. Again.

All I do is just procrastinate all day and keep things for the last minute.

At what point will I wake up and realise that I'm absolutely non functional as a living being???