Co-Dependancy or Interdependancy?

One of the most difficult things in my life right now is trying to figure out which things I'm co-dependant on and which things I can marginalize from my life. I never knew it would be so difficult. As I begin to post some of the writing I've been working on in my free time, I'll also add some random posts about where my mind is at, unless you can find it for me. I don't think being co-dependant on anything is a good thing, but I can't decide why. I know that interdependance is an amazing thing to have in your life, but I can't decipher the line that divides co-dependancy and interdepenancy.