hello and welcome to e.health forum. masterbation will not affect you now or in future. it won,t affect your kids or marriage unless your future wife objects.I can,t see where it will make you sterile.
We all do it women as well as men and its helps us explore what turns us on and enjoy sexual life and needs better. When shared between two people it makes things more exciting for you both.
hope this answers your questions always here to give advise.