Did I still eat wrong Please help?

I'm trying to lower my body fat.My friend bought me a muffin for a snack. I look at the nutritional facts. The serving size was 1/2 a muffin it was 252 calories and 122 calories from fat. So the whole muffin is 504 calories and 244 from fat. What I did was I only ate a 1/4 of the muffin. So that reduces thing down to 126 calories and 61 calories from fat I also drank green tea with it. Is that a good snack. Did I still eat wrong?