Index Of(jpg)boobs Underweight Teen Girl?

Underweight teen girl? - index of(jpg)boobs

Well, I'm very, very small for my age.
14 years old.
74 lbs.
4'11 "
I think my eating habits, but I'm still underweight.
That's what it says BMI index anyway.
I have not started my period but my breasts started to grow
(slowwwwwwwwly).
I think I blame my fast metabolism, my body, underdelevoped childish.
Please help me understand why this

Here is a picture of myelf: http://i38.photobucket.com/albums/e128/m ...

No rude comments please.