So masturbation doesnt create problem to penis thts wht i wanna kw. and wil masturbatkon increase sex stamina or what?

Not really: Frequent masturbation can cause penis irritation and broken skin due to friction injury. This heals quickly if given the chance. If you are in good physical health, much about "stamina" has more to do with proper rest, healthy eating choices, exercise and fluid intake, and your emotional state - especially confidence and healthy relationships. Wholistic health!. Hope that helps. Thanks.