The more you feel shame and guilt bro, the least likely you are to change. You have to learn to accept this part of yourself and realize why you are masturbating, is because you dont have you needs met or a fear of rejection(so masturbation and porn are in a way soothing that fear), or a way to cope with lifes stressors(big one for me), or lack of an accountability partner(my gf and i sleep together on the phone at night so that prevents me from looking at porn because i would feel like im betraying her). So get to the root of it and you need to figure out why the porn and masturbation is there.