Hello, Thank you for writing to us, Masturbation is normal thing which should be use for satisfaction of sexual feelings. But excessiveness in masturbation may be problematic. Once in a day might not count as excessiveness but if daily base it should be decrease. Masturbation will never affect your grades in collage or anything. Even i would suggest here that it should help because when your mind thinks about sex you masturbate but if not that your mind constantly thinks about it and you cant concentrate with anything. You should concern a good doctor for more details. Hope it will be helpful to you. Thanks & Regards, Dr. Gaurav Prajapati