Hello young man, first of all understand and keep in your mind that masturbation is not at all bad habit until it is compulsion. Almost 95% of the males in the world masturbate during their lifetime for a certain period. You are doing since 5 years means started at age of 15 which quite normal. It is physical requirement of body when boy enters in to adolescent age when hormonal changes take place. Masturbation daily once is not going to affect your health if you are taking meal regularly as it consumes not more than 150 Kilo calorie. Masturbation is the process in which you get orgasm with your own hand without partner while you do the same in your partner s vagina while during sex , so it is not going to affect your marital life. And by masturbation you are avoiding external sexual contact and avoid STDs. So just relax and do not think to quit this thing until your marriage as it is a need. And yes you can consult a psychiatrist or qualified sexologist to make examine yourself and assurance.