It really sounds like you're working hard to change things in your life and this is a great first step. Because co-dependency issues are relationship based, working on them in a group format can be enormously helpful.
But individual therapy for these issues (as well as early family issues that may contribute) can be very helpful too. There will be parts of your experience that differ from others in the groups you attend and/or things that you want to sort out on your own that are best dealt with in individual therapy. I would suggest that you find a psychologist in your area to work with individually-- if it doesn't feel helpful you can always stop going but given how motivated you are to work on these things, what's the harm in trying every angle?
Best of luck to you.
I was wondering about the followup question? See above about relationship?
Oh- thanks for the answer