Sounds like procrastination is the problem. It's strongly linked with perfectionism, and may reflect a problem in the pre-frontal cortex. I regularly feel terrible because I don't just crack on with things until the conditions are just right. But I don't throw myself at anything or force myself to perform tasks. What usually happens is that as time goes by the fear of failing to meet a deadline becomes greater than the fear of performing the task. Either that, or I just find myself effortlessly making a start - when that happens, I find it hard to see what the reluctance was about.