I think I know what you're feeling, I've been through the same thing. I'm not sure I wrote about it in my journal, but I was lamenting the lack of friends, my lack of future, etc. I don't really know how I got through this really. I still miss my friends as a lot of them are all over the world, I still have no idea what to do with my future... I think in the end I decided to enjoy what I like. I enjoy good food, I travel, I take pictures, etc. I try to get out of my comfort zone as well. I don't only sit at home but actively try to get out and do things.

In your case, why not try to decide what you want to do. If you decide to stay, why not move to a bigger apartment and by a cheaper car so you're more mobile. A job isn't necessarily supposed to be your life. If you enjoy it, good, as long as it doesn't depress you and pays enough, also good. Your life is what you do outside of your job. If you like to travel, travel. If you have a car you can make day-trips, 2-day trips. Even if you don't have one you might be able to do that. If you'd like a decent apartment and to keep a cat, get one.

Make a list of what you like and make notes how often you actually get to do what you like. Try to think of ways that make it possible for you to do it more often and work to get there. If you're not happy now, try to find ways to be happy again.