@izzythepush,
I have sympathy for the questioner, it would be hard to believe how little I knew at, say, fifteen.
I've strong views now, very positive about masturbation as a societal and personal good.
Our poster believes in sin - I don't want to interfere with that except to tell (him) that some of us think it is fine, good.
To add, perhaps some pastors somewhere don't think this is a sin.