Hello dear,
First of all remove all myths & misconceptions from your mind about
masturbation.
In fact, Masturbation is completely normal & doesn't have any bad effect to the body and mind.
Also the phenomena of
nocturnal emission is normal at your age.
Regarding the problem of
premature ejaculation and other symptoms, it's mostly related to
anxiety and lack of certain essential nutrients in the diet.
So...don't worry about all this & stay relaxed.
Avoid stress...practice
meditation..this helps in improving concentration & builds up the confidence level.
Your health can be improved by having a diet rich in fruits, vegetables, fish, nuts & honey.
Avoid smoking & alcohol.
Best thing is to eat a healthy diet, exercise regularly, avoid stress, get good sleep, think positive and stay happy.
Wishing you a Healthy Life.
Take care.