Hi,
Welcome to HCM,
The urge to masturbate is a normal physiological phenomenon especially in young,but ill health and loss of stamina is not because of
masturbation. But remember excess of everything is bad.
There are many such false beliefs because of lack of knowledge, and even nocturnal semen emission occasionally is normal.
As far as your weakness and lack of stamina is concerned please visit a Physician/
Psychiatrist to examine and if required investigate you for presence of any systemic illness like
Anemia,Infection, or may be just
Depression. If anything is detected it can be treated.
You should pay attention to your study,sports and carrier during these years.
Avoid watching sexually explicit material or even literature.
Just take care of your diet and exercise like playing some outdoor sport is good idea.
Take care
Good Luck
Dr.Akhilesh Dubey M.D.