Family and obligations

My relationship with my parents have not been the greatest over the years. I'm joining the church at Easter. I haven't told them anything about it yet. We're working on our relationship right now; I'm concerned that telling them would just set everything back - they have so many false ideas about Catholicism and a nasty habit of dismissing any counterexamples. It's that second bit that makes it really hard to explain anything to them; I can't just correct them or give them info explaining otherwise.

I don't want to get pulled into denying my faith, but...I sort of feel like it would go better if it waited a few years before I tell them. Not just to build up our relationship, but so I have a chance to ease them into the thought that maybe their ideas about Catholicism are wrong. Right now, the few times I've tried to obliquely bring it up have been met with simple disbelief. They tend to act like I'm a kid that doesn't really know what she's talking about - especially in the face of some Catholics and former Catholics my parents know that say false things about the church.

Am I doing anything wrong in not letting them know that I'm joining the Church? I do want to tell them eventually, I just feel like it wouldn't do anything right now other than convince them I'm being rebellious and stupid.