I could never image talking about masturbation with my mom (I can talk to her about sex, but for some reason not masturbation.

I have found it easier to discuss that with a good friend of mine, who is like a sister to me, I don't feel the anxiety from discussing it with someone that is an authority type figure, and it is easier to discuss it with someone on my own peer group.

Maybe you have a close friend you could discuss it with?