Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. Masturbation is not a sin. Masturbation is normal and natural and even animals masturbate. The masturbation habit if practiced properly cannot harm your health, cannot affect your concentration level and health. Almost 98% of the population masturbate at their teen ages. How many people got failed in examination or complaining about loss of concentration. All these problems are in your mind and not real. Below the age 20, once a day, between 20 and 25, thrice a week and above 25 once week is ideal. You will see the benefits if you follow the above routine. You can post a direct question to me in this website. Include every detail as much as you can. I shall prescribe some sex therapy techniques to control your condition. I am sure that the techniques should be a success. Hope this answers your query. Available for further clarifications. Good luck.