There is not a singular cause for procrastination. I've mentioned it many times on HN, but I think it's again relevant to recommend "Procrastination" by Burka & Yuen.[1]

Half the book is spent helping you investigate the root cause or causes of your procrastination, which can include fear about control (losing OR gaining it), as well as fear of success, fear of failure, fear of separation, fear of attachment. They discuss the influence of family and culture, gender, and the role of ADD & executive dysfunction.

The second half of the book is a practical guide to coping with your procrastination and habitualizing better behaviors.

If you're serious about procrastination, my only advice is to listen to the experimentally & research-backed psychiatrists.

[1] http://www.amazon.com/Procrastination-Why-You-What-About/dp/...