It sounds to me like maybe you have your self-esteem too tied up in what job you have. You want to be in your own profession and your new job reminds you that you haven’t been able to find one. That’s a blow to anyone’s ego. As you know, these are hard times for lots of people. It’s important not to take the current job market personally.
But here’s something to think about: Any career counselor will tell you that it’s better to have a job, even a job that’s unrelated, than to be unemployed when you’re looking for a job. Doing a job, and doing it well, shows a prospective employer that you are serious about being a worker, that you can be counted on to be responsible about attendance, that you know how to be a team player, that you have a positive attitude, that you have the initiative to keep developing yourself, etc. You can’t do any of these things while sitting alone in your room surfing the Web.
Your current job does not have to be seen as a step backward. You have been given the chance to be within an organization and to prove yourself. Do an excellent job at whatever it is and quietly let key people know that you want to pursue your own profession as soon as you can. Use this time to network within the organization and to take advantage of any in-service opportunities that are available. Above all, make yourself valuable to the team in any way you can.
You have been given an opportunity. It’s up to you to use it.
I wish you well.