My thoughts are similar to yours. The marriage is "good enough" for her. She is pretty insistent that she is not going to change, and she's not going to try to improve.She has stated the marriage is "good enough" for her. I have told her I want a wife, not a roommate. In the past, she has said "You better get used to it as it ain't going to change."
I seem to be the only one trying to improve, but she as said the "roommate" relationship is fine for her. I have tried to let things be as roommates, but it begins to eat at me as it isn't what I want. Any advice or thoughts?
It doesn't sound like this is what you want.
Yes, all I did was parrot back what you said, but the truth is, you aren't happy and you need a change.
So, start changing. Start living the life you want - get out more, take up your old hobby, and in general be less available. Show her your changes. Give her some other incentive to change other than your verbal requests for change, because that clearly is not working.