Friend,
this website is great for combating the problem you're describing. Browse the main website,
www.guardyoureyes.com, read some articles, perhaps get on a 90 day chart to help you and motivate you. This
here is also good read to help you sort out what you need and what you don't in this stage of the game.
However, if I may offer you a word of caution (and if you want to take a word of caution from a sexaholic), here it is:
You are a teenager who watches porn and masturbates. Perhaps, this
forum and other activities related to sex
addiction is a weapon a bit too heavy to deal with your issue. It's like using artillery to swat a bee.
Additionaly, if you decide to post here, please don't divulge identifying details, like a last name. Not everyone is accepting of guys struggling with porn-viewing, and you may get in trouble. You don't want someone googling you for a prospective shidduch few years down the road, and coming up with this post, do you?
Wishing you great success, and with much appreciation of your honesty,
Mottel.