How can I stop masturbation completely?

Greetings to all doctors. My name is James I have 19 years, I started at 16 to masturbate, I know it is normal that a young perform this practice. The point is that now, I do not want to masturbate, because I do not feel good practicing, because I m already entering young adulthood and I talked to my best friend who is my age and he says he stopped masturbate and how to know that makes me feel bad. The truth is that sometimes I m reading a book, listening to music or doing other activities and how my body is calling me to masturbate. Honestly before I masturbated about 7 to 8 times a month and this year are rare times I ve done as 2 to 3 times per month. The question is: How can I stop masturbation completely? Talk to a sexologist told me to stop eating lots of meat and I started eating more fruits and vegetables, Since the meat produce more male hormones, And it s those hormones which are gathered in my penis is the reason for having the desire to masturbate. I think it really worked because that was when I masturbated 7 or 8 times a month. and now down to 2 or 3 times. But I want to help me, I need something that makes me completely stop masturbation. Thank you for your help. P.S. I have girlfriend