Ewane,
You are not hurting God. You are rejecting Him. I know that is not what is in your mind as you engage these thoughts and actions. But, it is true. What also is true is that He right now extends grace to you to come to Him, surrender to Him your whole self and whole life, and live in freedom from this. It requires that you die to yourself and live to Him daily, moment to moment.
There is no method or ABC to victory here. There is a battle that you will never stop. It is fought one minute at a time.
Your sin, Ewane, is not a special sin. It is a heavy burden but not to God. He is well able to deliver you. Yet, I want to make this clear ---- God may very well NOT deliver you quickly. He may, instead, use this to slowly stand you up in Him.
You will seek God continually if you want to walk in the Spirit. He will change your heart. He will, in time and in the face of perhaps many failures by you, draw you toward Him as you keep pressing into Him anyway. This is not about merely delivering you from this particularly vexing sin, but it is His way to teach you how to walk in Him.
There is a time in this process where you will blessedly forget, mostly, the lustful things which now occupy your heart and mind. You will probably never be so fully free from the fleeting but returning flashes of lust that you could never encounter them. You will never be so fully free that you never need to flee those lusts. But you can be so changed, over time, in the Holy Ghost that He can make those thoughts melt like ropes in Samson's wrists.
You have to take step one. You have to start wobbly, you have to start shakily walking in new life.
I would say more about the victory side of this, but time is not available. I have some practical suggestions that are not answers and are not themselves the victory. But, I am aware of some low cost tools that you may access, IN FELLOWSHIP with others, and can help you live free in Christ.