I can certainly see how that prevents you from writing.
That sort of defeats the point of writing, doesn't it? If you don't have a plot, which is essentially the story, then how do you write? Plot is arguably the most important part of any story, without it there is no story.
For me it's bouts of writer's block, which I'm dealing with right now. Well, it's not so much writer's block, and more of I don't have the physical time to write.