ANSWER:
You must not look at whether the sin is major or minor, rather look at Whom you are sinning against! You must block the means that provoke your desire to watch such filth, so if you are watching it on the internet, delete those Apps etc.
First of all, you have to know that Allah is watching you in everything you do. You also have to make sure that you occupy your time with things that are useful. You must surround yourself with practicing brothers who would take care of you and guide you when you need guidance.
Attending circles that teach the Quran and increase your knowledge of Allah and His beautiful religion, this would help as well.