I think I ate a slightly bigger piece of cake?

Tweet

I thought I could eat a whole slice of cake, but when I found that I was too full, I cut it roughly in half and took a bite out of one of the halves. Then I realized that the other half was probably slightly smaller, but it was kind of hard to tell with the different dimensions of cake and so I completed the half I was already working on and put the other one away. I'm afraid, though, that I ate the bigger half, and I'm kind of kicking myself for not choosing the other half instead. Is it normal to feel this bad for something like that? How do you cope?