Conversation Disability

Ok, when I started university in September I was really jolly and enjoyed hanging out with everyone on my floor (standard accomdation) - everyone seemed to enjoy my company. But then I moved to En-suite accomodation and things were less social as there were only 4 other people in the building...and they stayed in their rooms most've the time - and after a while and went back to my original accomdation to hang out with peeps there but I felt different around them (and still do) - the 'social' buzz I got out of it was absent and I found myself really quiet around them...also feel as if not part of the group anymore....don't know what or why this good be?

Thanks :-)

D