Why do people keep telling me I have an eating disorder?

I am a female of 5 foot 2 and I don’t get a lot of exercise. I only burn about 1600-1800 calories a day according to my doctor. Which means I don’t need to eat as much as my roommate who is approx. 5 foot 9, male and works construction. Etc. What I don’t get is why everyone keeps telling me I need to eat more when I make sure that I eat enough to maintain my weight, get my nutrients, and stay healthy.

So I guess what I’m asking here is, why do some people think that if you don’t eat huge meals or you are not over-weight, that you must have an eating disorder?
For those who asked my weight, it is 118lbs and my bmi is 21.6 (a normal bmi is between 18.5 and 24.9)

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