No. Only if you do it to excess to the point of physically damaging your genitalia.
No. Masterbation is normal and will not hurt you unless there is trauma to the penis or irritation to the skin. Some religions view this as a taboo activity because regular masturbation may inhibit relationship development. Nearly every culture views masterbation as a private thing and it is usually socially inappropriate to discuss this activity unless in a forum open to that topic.