Unconsciously hiding myself?

I've noticed recently that my body sometimes tries to hide itself when I'm in any kind of social situation. For example, I'm about to walk out of my room into the kitchen and I hear my roommate making some food in there or something. My body physically stops and freezes until either my roommate leaves or I 'break' through and force myself to move.

It's strange because I do this all the time but I don't feel like I'm scared of talking to people or anything, in fact I love talking to people and being around people. I've noticed that I do this in pretty much every situation. Anyone have any ideas about what could be going on???