Mama, you have tried so hard! I hope that someday, when you look back on this experience, you can feel proud. When you give everything you have, it's not a failure even when it doesn't turn out the way you hoped.
Please let yourself go out in public, and don't feel ashamed about using formula. And if you feel like putting your baby to the breast, don't be afraid to offer it. He might turn you down, but there's always a chance he won't.