You know I had the same problem it got to the point where I thought I could not masturbate withtout porn. so when ever I felt like masturbating I would just think not look if you know what I mean. also try to delete everything that involes porn from your computer and install a internet "nanny" to force you away from those sites (trust me it works!) you dont have to tell your parents its because of porn just say that you have been "coming across bad material randomly" and that it is bothering you and you want to get rid of it
Or you can also try just staying away from the computer for a month, you might find that you will improve in other areas such as school and even heath (I know hard to believe!) so yeah that's about all I have to say.
I hope you can get help or help yourself with this problem
G()d |()V3S Y()U