Is there any staminal loss due to masturbation?

No. All your peers do it also. It's natural, masculine, lets your learn about your mind & body so you can be a husband & father, is fun & lets you focus on other things you need to do. Keep it private. If any "spiritual" or "health" person tells you it's bad for you, consider that person to be either a fool or someone who's tried to deceive you. If he's reasonable, dad might be a good guy to talk to.