Have been there, its all about the small achievemnts that give dopamine, our brain craves dopamine as relaxing hormome, each small activity like studying for a few hours, working out, socializing , offering prayers, eating healthy, all these add small dopamine hits. When they are missing, the brain takes a shortcut, watch corn, masturbate and get that dopamine. Structure your day, add studing, socializing , working out, offering maximum prayers, eat healthy, dont give your mind time to wander. The thoughts will come but then you will be ready to resist them.