I am 5'3 and 105 pounds in 10th grade is that considered small?

Answer 1

It's a bit small. Don't go on a diet for sure! Still, your body is still growing and your body could gain a bit weight. Your BMI is 18.6, which is fine (it should be between 18.5 and 24.9 so it's a close call), however, the BMI is not completely representative if you aren't adult, but in this situation gaining some weight would be much better than losing weight (which would be harmful).