Hi welcome to health care magic ... You are at very young age and in history you are mentioning erectile dysfunction , so detail history and physical examination needed ... When masturbation done more than two to three times in week than it is called overmasturbation...For which yoga and daily exercise done and pornography seen less. But you are mentioning erectile dysfunction so investigate your case with.... 1.Blood sugar to rule out diabetis 2.Blood pressure measurement 3.Physical examination of testes 4.CBC etc Avoid stress , smoking and alcohol that can aggravate your problem... If needed hormonal profile also done ... As such masturbation safe practical and directly does not lead erectile dysfunction... Behavioural counselling also beneficial.. Take care Advise : Consult psychiatrist