I'm hungry

The funny thing is that I KNOW it's psychological. Just thinking about losing weight makes me hungry - and defiant! I want to prove that I can eat anything I want to and still be healthy. Actually, that was kind of true when I was younger, but obviously not any more. I crave sweet, fat things. I have bought a few of those 100 calorie snack packs, thinking that, if I really am going to eat something sweet - and I will find a way - then I can at least control the calorie intake by allowing one package. As if. This is my major hurdle, the first one I really need to get over before I can be successful. I keep trying to give myself pep talks and motivation, but they don't last past the moment. Any ideas?