Stuck

I have to to, well not really,noones holding a gun to my head ,write a short story. and I'm stuck. I signed up for a Writers Bureau Course( well two and I have even less modules done in the second one....) with no deadline so yeah it's totally in my own time and under my own steam. I have written a couple in the past that worked but others were more like articles . And now I'm unsure of myself and can't even brainstorm. I could do this to help my daughter if she was stuck in an assignment so maybe I need to get her input. I liked English in school and have had a few very short pieces published which I managed to tailor to the specifications of what they wanted but now I can't seem to concentrate to do that. Maybe I need to to force myself to do it and just accept the critisisism,well it's not really critisisism  a tutor is paid to correct your assignments. I wonder how they are paid actually. Is it per person they take on or per assignment that actually gets mailed to them. I'm presuming they get paid something reagardles .They would have to , I think,if their student appears to have dropped off the face of the earth or resurfaces years later(like me)