12 yrs of catholic school & indoctrination. I know the nun you speak of. She was at my school too!
My parents were even worse!

Took me forever to change my thinking regarding masturbating, but I can honestly say that you can change it. You have to try!

I'm not going into my own reasons, you'll have your own, but a sexual urge is a powerful release of energy that's very fulfilling. It does your whole being a world of good!