Katy-Kat
Yes, almost underweight, you would be underweight if you lost any weight. So I would stay right at the weight you are. But at 5'1'', average is like 105-110. So yeah, you are a few below that. You are skinny, yes.
Tbone
Yea
librazone1948
No if you are about 16 years old then it is quite normal on the BMI scale.
Nadia
Yes.
It is also borderline underweight. So please try to stay healthy.