I'm not. ;)
I was blessed with great genes and a high metabolism. I eat as much as I want, tons of In N Out Cheeseburgers, gallons of Dryers ice cream, loads of pizza, and other stuff and I'm barely 90lbs and still fit in size 00 jeans. Actually certain brand jeans in size 24 are still too big for me.
Eating is one of my hobbies, I love good food. All I do is eat, eat and eat all day and I'm still under 90 lbs... and trust me, I eat A LOT.