Don't be so hard on yourself, Hope. You try your best, and your daughter knows that. Her quality of life may improve when her mom is grounded and stabled and has a good attitude about life. That is what will form her opinions about life and about men, the environment she lives in. Will you do your best and make it as good as you can for her? yes, you will, and she will know that.
Live your life while you are still living. Riding the trail less traveled.