I eat under 500 calories a day, is this an eating disorder?

I am a 15 yr old girl.
I eat under 500 calories a day because i look at my reflection and see a fat person staring back at me, but everyone says i am really thin which i think may be true but my mind tricks me.
Will there be any effects to my mood and any effects maybe to my body, and do i have an eating disorder?
And i wasn’t overweight before, but i have lost 5pounds in half a week and i am very close to being underweight.

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