I have several clients who worry that they are too scattered and can't maintain a good focus. In my June 13 blog, I talked about things to help maintain focus. That's fine if you really need to be more focused and it's causing you pain or problems to be less focused.
If you aren't really experiencing difficulties being the way you are, however, I typically tell people to embrace who and what they are. Insofar as it's possible, learn to live with your characteristics and your style—unless it's becoming a problem for you in some way or another.
People who fire off new ideas at a high rate each minute and who feel they're scattered often are very creative types. You may or may not want to mess too much with that if that's how you are. Go with who you are. Tweak your style somewhat if, for example, you aren't finishing work projects on time because you're bouncing from one project to another. But if it generally works for you, embrace your style. Add deep breathing, yoga or some other type of activity that can center you just enough that you can add some focus. But keep who you are at the core.
You might consider your scattered nature to be a flaw. Yet inside what you think is a flaw might just be wrapped some of your real gifts, such as creativity. Perhaps you are an idea person—and not the one who can put legs on the idea. Nothing wrong with that; let others develop your ideas and make them come alive. Very often what you think is a weakness can be flipped over on its other side and show up as a strength. Think about what makes you you and embrace all of it! It's really all part of loving yourself and setting the butterfly free.