Hello, Doing masturbation is perfectly normal and is not harmful to the body in general. It is a safest way to relieve you off your sexual urges. Problem arises when you start doing it unnecessarily and doing it deliberately by watching porn movies or reading porn.This routine may make you psychologically sick. It is always better to do masturbation when you get a natural urge or desire for sex and not creating the desire by watching or reading porn. Avoid addiction for madturbation as it would not allow to do your studies or do any other day to day activity. Best way to stop it is... Stop reading or watching porn. Do regular exercises for 45 minutes a day. Take proper sleep in night. Take more of fresh fruits and green vegetables. Avoid smoking and other drugs. You should me all right soon. Give more attention to your career and future rather than wasting time in porn material. I hope it helps Thanks