Hello eb62488, welcome to PC.
Have you ever been to a psychiatrist to be properly assessed? Maybe if you were seen by one, he/she could provide some possible options, such as medication or therapy. (By the way, just because one attempt at therapy didn't work, doesn't mean another attempt will end up the same way.) Many people have to see more than one therapist to find one that "clicks". Also, there are different types of therapy out there.
I'd also like to let you know that you're NOT a failure. If you can't handle a job right now, then you can't change that. Try not to beat yourself up about it. I'm 19 and on disability because I can't work. Sometimes I do feel that "failure" label creeping up in my mind, but I remind myself that I am literally
too sick to work right now, and being sick does not equal failure!
I hope you find this site to be a supportive and informative environment.