Having read the book "What to do when I want to do everything" by Barbara Sher, I now know that I am a scanner. A scanner is fascinated by something new every week ( or every other day) cannot commit to anything - afraid they will miss something better, starts so many things but finishes none of them, knows they should focus on one thing at a time - but which one?
My head is always full of ideas and I'm constantly thinking of things I should do or have to do. My resolution (see book) is to have a book with blank pages for me to jot down my ideas as I think of them and then they will not be lost from my mind. I know I will never get around to doing everything but again never say never.
Try it yourself - it may just be what you need to help you do everything you want to.