I was the same way when I was in the hospital. I would FREAK when new people would come in, but more so when I would get a new roommate. I did ebb a bit as I got used to it, but I don't know if I could get used to it in a hostel. I think that it is great that you tried and learned what it is you can handle and what you can't. I bet that there are other low cost alternatives, but now you know what you can tolerate and what you can not.