Thanks for the comments guys. I thought about perfectionism, but I'm very laid back when it comes to my other work. I was fine with my designs when I was a designer, and I was fine with my pottery (I did a lot of that in school). It was what it was. I could make good looking pots, but they were never going to be bought by anyone. They gave me pleasure though.

With writing, its different. Its the only thing I find myself coming up with every excuse not to do it. I do have a problem with execution, I get bored, but writing I despise. When I have bursts of inspiration, its really quite good. Good writing isn't the problem for me, its getting the writing done.