Actually, the Cathechism, as far as I know, is QUITE clear that we form our own conscienses. Are you telling me everyone in this world who has a mishapen conscience was jjust neglected by God because He did not give them a True conscience? I refuse to believe that. WE are responsible for forming our consciences.
Is it possible to unintentionally form our conscience incorrectly? Sure. But even then, you should CHANGE it if the Church is in disagreement with you, because Christ speaks through the Church, and if your conscience disagrees with Christ, you have problems! lol