Masturbation is a sin. It stands between you and the Almighty, and you are in deep trouble if you think it's okay.
I used to know what it was to pleasure myself in unhealthy ways, and that included things other than masturbation as well! But you have to understand, pleasure was created to spurn us to those things which are good for life and creation. Every time you masturbate the Devil is there to drink the fluids and it makes him stronger. So few people realise, that He's right there, because they are too seduced.
A sure fire way to cure yourself of this addiction is to wrap a leather strap around your thigh with barbs in it. Pain is purifying.