Therapy “doesn’t work” for many reasons. Sometimes the therapist and client don’t connect as they need to. Sometimes the therapist isn’t sufficiently experienced in the issues the client is presenting. And sometimes the client isn’t quite willing to give it an honest try. (Those are just a few of the reasons.) When people see me for the first time, I always ask them to trust their instincts. If they feel that we can work together after talking with me for half an hour or so, we probably can. But if there is something about the interaction that makes them feel too distrustful or if I remind them of someone they don’t like, for example, then they are probably not going to be able to engage as fully and honestly as they need to. In that case, they should interview at least one or two more therapists to see if they can find a better fit.
You’ve been through some terrible times. It is no surprise that you suffer from PTSD. Therapy really can help. I think you owe it to yourself to make at least another attempt to heal before resigning yourself to a life of isolation and unemployment. If holding a job and being more social is too much for now, your therapist would probably help you determine intermediate goals to work on until you have enough strength and health to take on relationships and a job.
I wish you well.