I can relate to so much of this, though I was diagnosed as autistic when I was about 10 years older than you were.
I still don’t check disabled on forms, but speaking of getting lost in lifts, I once parked my car beside a small store near my home, then forgot I had driven and walked back with my bread and milk.
The next morning, when I couldn’t find the car in the parking garage, I panicked. It’s hilarious now and I use it as a funny joke, but it was stressful at the time!
Why did I forget my car? Because I was chatting with a friend on the phone and was so intensely focused on doing that, I walked home on autopilot, no brain power left to spare for remembering I had driven.