Another thing, in addition to Inky, is you should try to sort out whether you are unhappy with the job itself (nature of the work), or your surroundings (coworkers, city you live in, frienship status, etc.). This is very important. Mull over it for a while.

If after a while you do find it is the job itself you dislike (hate office work, or dislike the kind of tasks you are given) then you should find a new job. Of course this isn’t easy. In this circumstance it is best to get a plan B together- research things you like and see possible careers with those, all while keeping your current job. When you feel you have the necessary funds then take up new education or employment.

If it is the surroundings that are causing stress, then there are many things you can do. If you feel isolated try to get to know your coworkers better. Sure they may be old, but that doesn’t mean they can’t have fun. Try going for coffee, or a pint of beer after work, or try getting everyone together for a potluck. Try something that gets you to know everyone. If it’s a mean boss or mean coworkers, let them know how you feel. The key is to find things that interest you and pursue them. If you miss your girlfriend/boyfriend, see if you can transfer to another location more convinient, or quit after a year or two and work in the same field, but in a different workplace that is closer.