I experience this too. I will climb stairs to the 10th floor rather than use the elevator. People standing too close to me in queue is likely to start a panic attack. I can't even have my husband sit on one side of me and my son on the other. One is fine, but not both. I will not travel on a bus and if flying is necessary, it also comes with its share of panic.

I have this space around me that I call my bubble space. And I am not very keen on having it invaded.

As you said, it is like being trapped.