My Running Rut

I am sitting here in my apartment, even though it is a warm, sunny, 65 degrees outside. I am a little tired, but that shouldn't prevent me from running. I am just in a rut. Since my less than stellar experience in the Springfield 5k, I haven't even run a mile. Unless you count repeatedly running up the stairs to retrieve more boxes from the 3rd floor apartment yesterday.
I don't know if I lack motivation or what, although the looming 10k should motivate me I would think...
Maybe I need a new outfit or something.