hi..thanks for writing...i have understood your concerns.. during masturbation person is stroking fast and with pressure..so it a kind of behavioral conditioning that develops in a person...because of these conditioning they ejaculate early... the act of masturbation and act of sex is completely different..so you will be alright, when you will face sexual intercourse..you shud not worry that you have premature ejaculation and it will cause any problems, otherwise it will cause anxiety and increases premature ejaculation and also causes erectile dysfunction... you need not to do anything right now, just decrease the frequency of masturbation to 2 to 3 times a week.. if you face similar problem after marriage then you shud consult a psychiatrist and ask for help..premature ejaculation can be easily treated with behavioral techniques like squeeze, stop-start methods and other interruption methods..and also effectively treated by drugs like SSRI antidepressants.. i hope you will find these advice helpful..best luck..