Ever get that feeling..

That no matter how hard you work it won't make a difference? I'm there..
I am sick of this and I would prefer to walk out right now. I do not want a job where I am held accountable for others mistakes and no matter how I fix it I still end up the one that is blamed. I am just done. I am trying everything I can do to not cry at my desk right now and it isn't working very well..and if you know me at all you know I pretty much only cry when I am angry and then I just get more frustrated with myself. I just don't think I am cut out for this...Dear GOd, I need a new job.