1. Talk to a therapist about your stress/anxiety issues. This can totally kill an interview even if you're qualified, and is probably a bigger issue than your perceived lack of skill. Xanax or other anxiety drugs can help a ton for interview days, but talk to a therapist first.
2. Keep trying. It can take a surprisingly long time to land your first job.
I strongly suggest you make some time with a counselor, and let him/her help you understand the real causes of your anxiety, and find a path towards managing it. This is what they do for a living, and AFAICT most of them are pretty decent at it.
My guess is that you'll have a better chance of enjoying programming, and perhaps performing better at it, once you get a handle on the anxiety.