Welcome to HCM,
I have gone through your history and please understand masturbation
in young age is quite normal and there is no question of addiction but excess of everything is bad. you must pay attention to your studies and career building is very important at this age.
Please do not feel guilty as it can lead to many psychological problems.
Please take balanced diet and take up some sports may be outdoor one and exercise not only keeps you fit but also relaxes you.
Please avoid watching provocative movies and reading explicit material.
If you have problem in dealing with it consult a good Psychiatrist
which will help you immensely.
Dr.Akhilesh Dubey M.D,