Well, it feels a little like coming out of the closet, but I have to admit (and I do so happily) that I have too many started projects to count. There must be one for every mood I may be in. I love them all, they all get attention now and then, and they all will get finished. I would go mad if I'd have to stick to one project only. But other quilters feel like having a nervous breakdown if they feel like giving in and start project number two. We are all different. It's ok, as long as we enjoy what we are doing.
You may find that you can stick with one project for longer if it has several different blocks. Or if assembling the blocks gets a little monotonous, some funky music might help.