lack of motivation

I'm really struggling for motivation right now. Today I have my 3-2-1 workout and to be honest I just.don't.want.to.do.it. ! I'm tired, I'm sore and a little shaky from my workout yesterday. I know that I'm gonna DIE tonight. :sigh: I have my workout clothes on, and I'm just watching the clock slowly go by. I'm trying to drink some water so I don't get dizzy, I probably should eat a granola bar to help me with energy during the workout but I had a late lunch and i'm so full. ugh.
I'll probably do it anyways. Hopefully I will switch into beast mode once I get going...