I wish I knew why.
Some of my best guesses include: Traffic noise is driving me insane (it's all the more obvious after spending time somewhere without it). I recognize that I'm not good at setting up time to spend time with friends as I dislike calling people so I realized I missed an opportunity to develop friends by not living on campus when going to school.
Why is it so hard to maintain contact with people? I wish I was better at holding on in the face of the alienating structures of our society.