Not Doing Good!

Yesterday I came home from my son's field trip and ate some fudge peanut butter bars and milk and felt like I blew it. I then had a protein shake and a lettuce salad for supper along with a few bites of the rest of the family's meal.]
Today I was in town and bought some of the lower priced donuts and pastries at the front of Walmart that I always notice and figured this time I would get some for my family. I came home and ate one and snitched some more! Where is my self control? Why can't I do this?