This doesn't always happen, I often have no problem hanging out with people. But for example I was sitting in my room and needed to get more water, but my roommate had a friend over and they were laughing in the kitchen and I was kind of sad, so I literally just had to sit and wait getting more and more thirsty until they moved somewhere else. This type of thing happens all the time.

I have no idea what causes it, but it keeps me from doing things that most people would never think twice about.