Getting a new story together, in between others…

I wonder why, as a writer, I never seem to be able to stick to one story or idea from start to finish. I always seem to teeter back and forth among several different stories, writing on all of them at the same time, until finally several books come out. I am not sure if this is a good thing or not…am I spreading myself to thin? Who knows…but I like it. I love the feeling of being able to create so many things, to explore so many different worlds. I suppose the test will come when that GREAT idea hatches and my agent won’t be able to sit still!!!