Masturbating two times a day, is that too much? Will I be able to have children when become adult?

Hi I'm 15 years old and I masturbate almost 2 time a day so I'm scared about not being able to have children when I'm an adult becaus I will not have any sperm left. I don't now what to do ??? Should I stop or is it normal????

PS: I would like to shave all around my penis is it ok?? And how should I do it ?