Am i at a healthy weight?

I am 11 years old and i weigh 103 lbs. I am 5'3. My BMI is 18.2, underweight but just barely underweight. Every other girl in my grade is like 50-90. I dont look fat at all. I dont know what to call myself. I need help. I use a treadmill 5 days a week and play soccer. What is going on?

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