Weight loss not working for me why?

I'm 13 years old at 162cm and 42kg. According to the internet, my BMI is 16 which is apparently underweight but Im fattt!! I put on 4 kgs since January I consume about 1400-1500 calories a day but my goal is 1200 (never stick to it :( ) I dance 2-3 hours a day which according to myfitnesspal, i lose about... show more I'm 13 years old at 162cm and 42kg. According to the internet, my BMI is 16 which is apparently underweight but Im fattt!! I put on 4 kgs since January

I consume about 1400-1500 calories a day but my goal is 1200 (never stick to it :( )
I dance 2-3 hours a day which according to myfitnesspal, i lose about 400-600 calories from it and I'm pretty active. But why have I not lost a single KG???
What am i doing wrong? I use myfitnesspal to record my calories, and i eat junk food sometimes but i always stay under the calorie goal
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