Writing Requirement Hell

Although I have made a significant dent in my writing requirement, I am probably about 10-15 pages away from completion. I never thought it would happen but I am completely out of BS. I know that is not supposed to happen to a future attorney, but it has. I am completely and utterly unmotivated to finish even though my advisor is probably going to kill me. I worry that this is a bad pattern for me. I often have to have my feet to the fire to get things done. Why can't I just be a normal person and be motivated to finish without a scary deadline?