I think the problem is I'm too inexperienced as a writer to deal with it. Each character has their own plot, their own back story, their own subplots. And I have about...2 main characters, 2 major characters, and 2 minor characters, and they each have their own story which needs to be told.
...I have no idea how to merge together all their stories in a coherent novel. :C
So long story short, I have too much going on and I don't know how to break it down.