Dear Love2Bworldly,
Why do you think you are codependent? Is it just because someone in authority TOLD you that? Doctors can and do mis-diagnose.
If you really are codependent, then I say yes, you can successfully overcome it. In order to do so, you must break old patterns of thinking and learn healthy new beliefs about living life.
One thing for sure: stop BLAMING yourself for your perceived failures. You did the best you could with what you knew at the time. With experience you will learn healthier ways, but stop being so hard on yourself in the meantime.
Find something in the library about loving the SELF. If you learn to love yourself and validate your own worth, it is easier to let go of self-blame. Loving the self will give you confidence that comes from inside your SELF, rather than being an approval sponge. Live for YOU and not for others. You can still be in a relationship (if you want) but you don't have to stay in a sick one. The choice is yours. Give yourself permission to make your own decisions.
Keep in touch and let us know how it is going.
satinka