How can I stop being completely miserable?

I recently moved to a new city, and I've been here about 6 months. When I moved I broke up with my girlfriend. I was completely in love with her, we lived together, and we spent a lot of time together. If the breakup wasn't devastating enough, I moved to a city with very few people my age. I've been having a terrible time making new friends. I work in a small business with a married couple and one girl near my age. She is married and rarely is interested in hanging out outside of work. I spend everyday in a cubicle at work, and my work is so uninteresting. I've really tried to get out and make friends. I take my dog to the dog park nearly every day and try to talk to people there. I am taking a dog training cl, but no one there is near my age. I'm going to be taking another cl at the community college at the end of the month. I feel like I'm really trying, but I'm getting nowhere! I have no close friends, my job is miserable, and I live in a really uninteresting place. I feel like I've really been trying to make the most of this for the last six months, but I just don't know what to do anymore. The worst part is that I have no one to talk to about this. Any ideas would be greatly appreciated.