I am 84 kgs (184.8 lbs) Am I fat?

I am 6 feet 2 or 188 cm tall. I thought I was healthy but compared to the next top models I am considered fat. Some weigh as little as 50 kgs and are as tall as me. I eat healthy food, exercise and people tell me I look good, but after seeing these girls I look fat around the middle and waist and tops of my thighs. Do I need to diet?