Samantha, I'm so sorry you're having a rough time.
It's great you're acknowledging that there's something behind the eating. I'm not fluffing you off at all (we're TOTALLY here for you, sweetie), but is there anywhere you can get some therapy? I know how hard it is doing it alone. I'm in MAJOR therapy right now, and I'm hoping it's going to help.
One thing you could start with is to make a list of what you believe your failings to be. Then make a list of reasons that you're NOT a failure.
Then take the list of "failure statements", and turn them into a positive statement.
For instance:
"I am a failure because I didn't finish college" can become, "Although I didn't finish college, I have a decent job, and I can always go back to college at some point in my life."
"I am a failure because I have a bad temper" can become, "Although I have an anger problem, I have acknowledged it, and I working on changing."
"I am a failure because my boyfriend left me" can become, "My boyfriend left me because I have admitted to having problems, and he can't deal with them. If he can't be there for me throughout the good and the bad, then he's not worthy of my love and attention. I am a good person, and I deserve more than he has to offer."
You're NOT unworthy of love, hon.
We're here anyway we can help, okay?