Procrastination. Lack of action. Thinking about what you want to write instead of writing it. What if you let go of the idea that these are human faults and look at them as resistance--an actual force penetrating your life and getting in your way. Steven Pressfield writes about resistance as "a repelling force. It's negative. Its aim is to shove us away, distract us, prevent us from doing our work." (Check out The War of Art to read more).
I think we experience this energy as inertia. It's easier to go with the flow than to change course or try something new. Resist change. Avoid risk. Steer clear of judgment (yours or anyone else's).
Either way you look at it, there's an energy flow pulling or pushing you away from writing. Think about that for a moment. Procrastination and avoidance do not mean you are lazy, lack discipline, or are incapable of finishing what you start. You are up against a force hell bent on keeping you where you are.
Would you respond to procrastination differently? Would you stop judging yourself? Would you rise to the occasion and say, "Don't tell me what to do"? Would you show up at your desk, pen in hand, just to spite it? I would.