>>Ah, Julia, I am such a fool! You should know that I don't deserve you...

Seriously dude don't be silly, don't ever say that to her. Ever.

You deserve her because she wants you, tell her that and you say; You're a moron for wanting me, stop it.

Obviously there is something good about you, perhaps everything but your fear and self-loathing. She is helping you to get over that now, so just happily accept her help and drop the degrading melodrama.

Tell her this instead, if anything: "You make me want to be a better person." or "You deserve the best that I can be." Something to that effect, cuz you know that shit is true dawg. Now go do this thing.