And I (20 M) have never thought I could actually make it. I was seeing really awful stuff basically everyday or sometimes even more since I was like 13 years old, maybe earlier? I felt extremely awful, animalistic. I did it to make life slightly more bearable and yet it only made me more nihilistic. I didn't even realize how poisonous it was until I have managed to remain chaste. It isn't even a challenge now at this point and my life has been so much better when I don't think constantly about porn. I think prayer really helped, since I pray everyday, usually rosary.
I am writing this to say that you really can follow God and remain chaste even if you haven't been from a young age and even if you feel you are a lost cause. You aren't.
God bless.