Since you still live under the auspices of your parents, best not to rock the boat too much...yet. Hell, look at it this way-you said you're from a long line of catholics. Consider your participation a nod to family tradition. I know that probably doesn't matter to you now, but it may later...if not for religious reasons then for 'family ties' type ones. If nothing else, knowing where you come from gives you solid ground in knowledgeably refuting it's more silly aspects. Life is learning, after all...both the good and bad.
Take a breath...no one can force belief on you.
Take a breath...no one can force belief on you.