Hi Revooh!
Firstly, I would like to congratulate you on your desire to improve- it is truly admirable!
I’ve been there done that, too. When I was your age, I too, listened to non jewish music. BH, I do not today. Believe me, it was no easy journey and many people did not understand my struggle.
Believe me, I understand your struggle cuz I had it too. It is very, very tough. Every time you think ur gonna go crazy cuz you need to listen, just rememeber that ur stronger than you think you are and that Hashem is cheering you on.
Practical Advice:
Right now, you can not even imagine being without non-Jewish music for a day without going crazy. That is because you never tried it. After making a promise to try never to listen again, and sticking to your word, Hashem helps you and it gets easier. I promise, it does! And the more time that passes, the less you will feel you need to.
That being said, I still missed the pleasure that the tunes of non jewish music gave me. So I reached out to a well-known Torah personality and told him of my struggle. He advised me to keep a few certain non- jewish songs that are 100% clean, and keep them close for comfort. (example, the climb, stand).
Good Luck in your quest to do the right thing. May Hashem guide you on your journey.
Be strong!