inaction

I have this major paper due on Monday, and I am paralyzed into inaction. Why do I get like this? I know it has to get done, yet I ended up wasting the whole day yesterday. It is not a matter of 'needing the time pressure' or some other juvenile excuse. Am I just that afraid of trying? 'Cuz if I don't try, it's okay not to excel, right? But if I do, and it's still not good enough, then that's a reflection of my ability. Not sure what that says about me. I don't want to write.