Starting a career can be scary, but I don't see it as a pass or fail situation. Focusing too much on how it could be a failure might be causing you much of the anxiety. I think that first job is a starting point to learn as much as you can about that kind of work. If it doesn't work out, you use what you learn to find a second job that is different. I feel once you have experience in a field, you start to see a variety of related career paths and can move towards one that works for you. I've done that in my job.

I hope you find something very soon!