Thanks for your query,based on the facts that you have posted it appears that you have problem of night emission .
This is a normal phenomenon to get night emission at the age of adolescence and nothing to be worried about it .
It wlll get resolved itself without any treatment over a period of time.
Try to practice moderate exercise everyday for 45 minutes and take high protein diet with fruits and vegetables and vitamins
.This will help to built up your general health.and to get good sound sleep.