I keep gaining weight

I started with 111 pounds and now I am at 114 pounds. I really want to get to 105 pounds but for I gain the weight instead. My dad likes to take me out to eat and I thought I was minimizing myself not to eat too much but I guess not. Also, I tend to crave so much junk food that I normally don't eat on this diet. Like peanut butter or crackers with cheese and things like that. I don't know why. Please give me some suggestions! Thank you!