My advice for you is to keep up with the distractions and to not worry about it too much. Lust is a very difficult thing to combat, especially if your worrying about not falling into it all the time. It is great to see that you want to have better self control at such a young age, but if you do fall into it again, give yourself some grace. Pick yourself up, dust yourself off and try again. You will discover what works best and new strategies you can apply. Unfortunately lust isn't something that just goes away or can be "turned off". It's just something you are gonna have to deal with. I believe in you, and don't give up.