people call me too skinnie am i?

Question

5' 1" 83lbs 12 years old

Answer 1

You should weigh no less then 98 lbs at your height, so yes, you are to skinny.

Answer 2

You sound very small. I hope you aren't trying to do this. If you are this way naturally, don't worry about it. In time your body is going to make changes.