I need an ass kicking

Why is it when I try to loose a little weight I just can't? The more I focus on trying to get rid of this fat on my stomach I just eat more. I went to a potluck party last night and everybody brought great food. I had to take an appetizer so I made a household favorite, tomato and garlic tarts. We hadn't made them in a few years so I tested out the recipe the day before and then we ate them all. They are so awesome. I made a double recipe to take to the party yesterday, I ate more there along with a sampling of everything else. I am totally hitting the toughest Jazzercise class tomorrow.