Does anyone else also have fear of their neighbors?

I have a great fear of my neighbors since I moved to my girlfriends apartment 2 years ago. I have lived in the suburbs in single family houses since I was born. I always had friendly relations with my previous neighbors. Despite living in several different locations, I always felt like I was in my right place.

  
My mood changed drastically after moving to my girlfriend's apartment located in city center. It is first time I live in such crowded place and in apartment building. My immediate neighbors are on their high horses. They don't even bother to say anything or look at me when I simply greet them   
when we pass each other in the corridor. I feel like they always judge me. I can't feel safe or spontainous in my own house, because I feel that they judge every sound coming from my apartment.   
I can't even park my car in the parking lot, because I feel that they are watching me from behind the windows and judging me. One time, I accidentally looked out the window at my neighbor as he was getting out of his car and I think he noticed me. Since then I fear that he thinks I am creep.

I live in constant fear of them and I don't really know why. My girlfriend always tells me that I should completely don't think about them, because they certainly don't care about me. I know she's right, but I can't help to worry about them. I feel like I am living on their territory, and my house is under their control. Does any one know what can cause this feeling? Maybe I am used to friendly neighbors and this change is too harsh for me?

I have mild BPD disorder and I am seeing therapist monthly. I told him once or twice about my social anxiety, which is mostly focused on my living in crowded place and on my neighbors. He simply told me that I won't change my perception of neighbors so it is best to move out which isn't possible. I feel that there is something that could help me with this anxiety, but I don't really know what.