Masturbation is okay?!

I (20f) finally sat down with a youth leader today to discuss some of my struggles surrounding masturbation, lust, and pornography. It took me a while to gain the courage to discuss this since my boyfriend also attends the same church and we have many mutual friends there.

While I was expecting some of the things the youth leader was talking about (porn and lust are dangerous and sinful) I was surprised when he said masturbation was not necessarily a sin. Is this true? Or is this an interpretation of the scripture and not necessarily something everyone believes?