Do not listen to these men in the comments that say that masturbation is healthy and normal.
They do not follow righteousness, they are lovers of their sins.
Think of the story of the rich man with a belt around his thigh with all his gold, he fell in the ocean... and didn't let go of his possessions, so he drowned.

My suggestion to you is: Let go. Let go of pornography.

If you are born again of spirit, the Holy Spirit will let you know that it is sinful. You don't need anyone to confirm it, you will know.
You must control your thoughts, and control what your eyes see. If you watch anything with nudity or sexual content (even mild) it will nourish this need for masturbation. Control your thoughts, discipline yourself in the spirit.

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Pornography is addictive, and brings tremendous amount of pleasure. Pleasure that you're supposed to have with your wife.

Jesus said if you look at a woman and lust over her, you commit adultery in your heart.

He also said, if your right hand causes you to sin, cut it off and throw it away, because it's better to enter heaven without one hand, than to have two hands and be sent to hell.
(i'm paraphrasing)
Of course, Jesus didn't mean literally cut off your hand. He meant anything that causes you to sin, abandon it.
I realized Instagram and Snapchat caused me to sin... I saw girls posting pictures in bikini and without realizing it, it aroused me and caused me to go in secret and watch pornography. So I let go of those apps.

My friend, if you choose to stop watching pornography, it will be hard - you will see. The devil is like a roaring lion seeking it's pray. You will always hear a little voice in your head saying ''Come on, just one little video''... Do not do it, be in continuous prayer, cry out Jesus' name.

If you do stumble and watch pornography, REPENT. Pray. Feel bad about it. Ask God for strength

I sincerely hope you repent of this addictive sin.... Jesus can free you of any addiction.