Self sabotage

I was going to post a Rough Day Part 2, but I didn't end up having time, and that boat has sailed. I am realizing that I'm not able to do this on my own, and am signing up for Weight Watchers tomorrow. Sometimes I feel like I have so much weight to lose, that there is no end in sight. For this reason, I end up quitting. Why is it so difficult, when it sounds so simple? Just eat healthy, and exercise. How can something so easy, be so hard? What am I holding on to? It's not like this weight has any benefits. Okay, so maybe it's that the food tastes so fantastic, that I can't stop chowing down. Have you ever noticed that food looks better than it actually tastes? The first couple bites are good, but the more I keep eating, the more it starts tasting gross. I have this strange mentality of, "I ate a couple cookies today so I already failed. I mine as well continue to fail, and eat as much fat and sugar I can get my hands on!"
The cycle has to stop. I'm the only one who can stop it. Obviously the desire isn't enough. I have lots of desire to be thin, but yet continue to sabotage myself. There must be something more that I'm lacking. I need to get to the bottom of it, or I will never be thin again.