I'm a mess physically, mentally, emotionally, and spiritually

I'm in my late 50s. I never loved or have been loved. I need deeper help than is offered in my small town, but I cannot leave this town because of agoraphobia. I find myself losing hope more and more. My brain barely works anymore, and my memory so small, I forget in a moment. I serve no purpose. I'm incapable of work or anything of value, and I never have been. I'm a complete waste of time and resources, and yet I keep trying. Why? Why does God insist that I continue to exist? I'm not suicidal, just tired.