Help about parents&religion!?

I've been raised a Roman Catholic since birth. My parents are semi-devout ( I would say ). My dad used to go to adoration every Tuesday at night but now we r moving so he quit. Well, the past few years, I've felt the urge not to be Confirmed in the Catholic faith. Whenever I bring this subject up with my parents, they just yell at me. I can't really ignore my wishes not to be confirmed next year. I can't talk to my Religion teacher, or anyone at my school (i got to a catholic school)...I really want to discuss this with my parents, but don't know how to in a way that won't make them super angry. I don't want to be confirmed nxt year because once your confirmed; you'll always be confirmed no matter what. :x ugh please help?