I'm beginning to feel completely stupid and worthless and wondering why anyone would want to hire me anyway

I have experience in accounting, communications, journalism, data entry, record keeping, and general office management/administration, but nothing I do is ever good enough for anyone. Not even for jobs in any of these fields which require no experience. And now I'm just beginning to wonder if I'm just incompetent and unemployable for any job besides the job I'm doing now (jack of all trades type part-time office assistant). I am desperate for full-time work and I'm applying to similar jobs at similar companies. I'm really beginning to lose all hope. I feel so defeated before I even begin an application and half the jobs I see I don't even bother applying because I think, why would they even want to hire someone like me anyway? Obviously I am totally worthless and have no employable skills whatsoever. At least that's how I've really begun to feel after six months of job searching has turned up nothing.

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