Where do you fap? What are you doing before you fap? Go do something different some place else. You can't just stop flapping as a healthy male, you need to make other changes that not only stop you from fapping, but improve your life in other ways.
For example, if you sit in frony of a computer for 8 hours a day, just not fapping will not only be very hard, but it won't do you much good if nofap is all you plan on doing.
Changing habits sucks, we are comfortable with our misery, but there is a better life out there waiting for us.