Writer's Block

Maybe it's just that it's back to teaching and I'm coming home mentally and physically exhausted, but I look at what I've written and all I can say is "This shit sucks." I look forward to it all day and I finally get to sit down with my computer and wonder why I've wasted almost 2 years of my life writing. Except to make me a better writing teacher so grading the scribbles of 90 sixth graders will take up so much time i can't write, anyway. Hell, I could have been watching TV!