ZenFender, I think your instincts are correct. You've identified that you have an unhealthy attachment. The voice you wish you could "shut up," is called your ego. I think most of the planet is in exactly the same position as you. You have a huge advantage though: you are consciously aware of it.
You've made the decision to deal with it. I commend you for that, big time.
A book that I recommend for you is Eckhart Tolle's "A New Earth" which deals to this very issue in beautiful and very practical terms. Another thing you might want to look into is EFT. I agree with Dharma that it is most likely an "emotional" issue.
The problem with my advice to you is definition of terms. If you had talked to me about "attachment," "ego," and "emotions" even a year ago, I would have taken it all the wrong way. "There's nothing wrong with my ego, and attachment is a GOOD thing," I would have said. So, spend some time (if you haven't already) and read some Tolle. But, I can't commend you enough for having the awareness to recognize something in you that you wish to address. Most people never recognize the problem with their own ego in the first place.