Hey man. First of all, I want to tell you how happy I am that you are dealing with this problem while still a teenager. It makes me feel great that you will not waste your 20's with this nonsense the way that I did.
I'm also really glad that you are adamant in not looking at porn. You must be careful, however, because relapse can be quite sneaky. Something as mundane as reading about Thai massages can lead to some innocent touching; which can lead to taking a peak at some sexy pics; which can lead to some less than innocent touching; which can lead to...I tell you this, because I've done it many times.
Now, let me tell you what has helped me in dealing with urges more than anything else (this is the idea contained in le_petit_moster's hack book, based on Allan Carr's method for quitting smoking, which I also used). So, since I've read that man's book I have not even come close to relapsing, but I've definitely had faint cravings from time to time. For example, I'll get the image of one of my favorite porn scenes (garbage) in my head. What le_petit_moster says you do when this happens is say to yourself "Thank God (or whatever) I don't have to give in to this urge." I say that out loud to myself, and then just continue doing whatever I'm doing. And then the urge just vanishes.
The idea is to get your conscious mind on the side of not looking at the porn, and not to get sucked into an internal battle, whereby one part of your brain wants to fap, and the other part doesn't want to fap. This creates internal tension, which only makes you want to fap to relieve it. So, you need to get your conscious and unconscious aspects on the same side, which is what saying to yourself "Thank God I don't have to look at porn anymore in my life" is supposed to do. You are re-programming your unconscious mind to want to have nothing to do with fapping, which is an incredibly powerful tool.
What are you planning on studying at university, may I ask?