I also haven't told my parents- my mom is so much anti-Catholic that even mentioning things I'm learning or showing any support (like, "Wow, Mom. My Catholic friends on my message board are great at explaining why baptism is necessary for salvation!" Now, this is a theological stand that she agrees with, but because she is so anti-Catholic, she scoffs and asks "Do they use the Bible or just conjecture?" *sigh*) gets a negative response.
But, while your baptism would be valid in the Church, it wouldn't be for the same reasons. Are you ready to see baptism as redemptive? It's not just a symbolic thing in the Church- it is a grace-giving act of faith, one that cleanses sin. This is a very different view from Baptists.
I would hold off. I know it would be hard disappointing everyone, but until you learn what it is really for, it might be best to wait.
(And I have never, ever told anyone to wait to get baptized. Heh.)