How can I break my o addiction with out telling my parents that I have this problem?

I am 17 and a junior in highschool, i have been looking at sence around 6th grade, i am real emarrised about this. i want to do somthing before this goes too far. First just pictures would satisfy me, then that got old and movies would do the trick, now i done with movies, I am afriad that I might do somthing I wouldnt usialy do when I am looking for my next fix. I have tryed almost every thing, puting parential controlls on the computer, but i will find a way areound it, I have tryed quitting cold turky, i need help sierously.