Weird

When a stranger sits next to me on a bus, I get really nervous and want to leave instantly.
Therefore I try to avoid this situation at all costs, placing my bag on the seat next to me.

This also happens in an auditorium if I'm sitting in the middle surrounded by people; I get nervous and restless because I can't leave whenever I want to, I'd have to ask all those people to move.

I've been experiencing these situations more; before it was only a problem if I knew there was a lot of space (e.g. the bus stop bench) and despite the space someone sits really close to me... That was and would be a horrible situation for me.