Ok every one Im trying to find the name of a movie that seemed to be pretty popular, cuase I seen it on TV a lot. From what I can remember There is a Boy and a Girl and their about 17 yrs old. When they were young they moved to their uncles house on an Island and he died so they lived there all alone I think they were stranded on the Island. I can only remember about three scenes from the movie. 1. When they were young the uncle tried to teach them about things and how to servive. 2. The boy in one scene makes fun of the Girls boobs developing and he puts coconuts up to his chest. 3. The last scene I remember is that The Boy Is out In the Ocean about Knees deep catching fish and he steps on a poisones fish or something and gets hurt bad... PLEASE HELP

Possibly "Blue Lagoon"? In that one, the kids were shipwrecked.

Yep
It's the Blue Lagoon.
They were actually closer to about 14 years old, if that and they were shipwrecked with the ship's cook on their way to San Fransico.