PD: sorry for my english, i'm still learning, and if you need any help just say it
there are people which think that is nothing wrong with masturbation and there are another which think the opposite, but if you are asking how to stop masturbating it's because you probably think it's wrong... well i think that you masturbate too much and maybe this addiction is affecting your life in many aspects.
If you want to stop, you should try to do less and at the same time, think why do you masturbate that much, because it's not just a physical need, it's also a psychological need, if you find the reason maybe you'll begin to do it less.
As humans we have a lot of habits, and this habits get stronger when we practice them over and over again and while you masturbate everyday it will be much more difficult to stop doing it. Just imagine when you are 25 or older and you still have this addiction.
10-15 times is TOO MUCH .. Don't be too harsh with your penis and keep it around 2-3 times a day . Go out with friends and try to engage yourself in different activities rather than just sitting in your room alone . I don't think that you will have problems in reproducing in future but to have a healthy sex life , you should keep it to a limit because it might lead to premature ejaculation , erection problems ,etc. take care .
how have u tried to stop if i no that i kan help u further