That's really unfortunate.
I think a person's relationship between their parents and themselves should come before video games.
(I should really follow my own advice..) So if you can find a way, you should probably have a long talk with them about exactly what you do. Go through your contacts list, and maybe have a tape recording of their voice (With their permission) And prove that it's not pedophiles, but actual people. If you want, I would be more than happy to write a few pages or paragraphs detailing my personal experience, as a testimony that I have never met any pedophiles, and have made many long time friends who helped me through my personal issues.
A low, but possibly effective, method to get them to understand that what you do gives you joy is to "fake" depression. It sounds
really, really evil, I know. Just minor depression to your parents. Whenever they comment about your "addiction", start tearing up, maybe crying a little bit. I don't know how empathetic/sympathetic your parents are, but if they
are, then they might see that their comments are hurting you on the inside. If they're not, then don't try this.
***I do take depression seriously. It's not something to be joked about.
Edit: You can also try to explain that as Catholics, they should be compassionate and be supportive of what you want, not hard-hearted. I have to go now, but you can try to think of ways to elaborate on that. k thnx bai