How can i stop watching ?

in the past few years, i have steadily been developing an addiction to . every other week or so (while i'm thinking in the shower or something similar) i tell myself that i can't watch anymore. or that i shouldn't. but that appendage... it keeps lying to me! telling me that it's ok to watch just a couple of vids while the family is gone. or while everyone is asleep. and i give in time and time again. it really must stop, but i can't tell anyone i know about it. don't tell me i'm sick or to get a girlfriend, because that won't help me any. is destroying many aspects of my life(i can't get a sufficient amount of sleep because i stay up 'til 4 o' clock in the morning , my future life will be affected cuz it'll be tougher to get an , etc.) i want to quit but it's so easy to sucb to temptation :( . what should i do?