I suspect that your neighbors aren't overly friendly to you, because you are single. If your city has a big crime problem, you're probably viewed with suspicion. Take the opportunity this Halloween to sit in your front yard and give out candy to the kids. It will give you a chance to at least greet your neighbors. When new people move in, make the effort to welcome them to the neighborhood.
I'm very lucky to live in a small town where crime is just about nil. With the exception of one family, everyone on our street is friendly. We all help each other out. I hope things get better for you, because having good neighbors makes for a happier home.