i cannot diagnose you blindly over the internet so i would strongly suggest that you inform your parents immediately of your findings and concerns. you need to see a medical provider for a proper examination.
my penis is shriveled up head yellow shaft dark i'm 15. an hour ago i pulled down my pants and my penis was shriveled up the head was yellowish and the shaft is stiff i'm not hard though and the shaft is dark almost kinda purple i can't get hard and my testicals are hanging low and kinda hurt i have been feeling sick the last two days i'm 15 please help