Should I tell my family how I feel?

I was raised as a Catholic, but in the last few years of "soul searching" I've discovered that I am agnostic. Whenever my family brings up religious discussions I get extremely uncomfortable and I just don't know what to do. I know my parents would still love and accept me if I were to tell them how I feel, but I also know they would try to convince me otherwise, and that no matter how hard they tried to completely accept me, they would always be a little disappointed in me. the one time I told my Mom I was even slightly questioning my religion a few years ago she was on the verge of tears. So my question is this: Should I finally liberate myself by telling my family how I feel, or should I suppress it for another year (I'm 17)