There are certain mysteries in Catholic Church teachings that would seem to defy human nature as we know it, the Marian Doctrine being a good case in point. Having trouble believing, accepting, coming to terms with it? Well, I don’t know the exact quote in various Bibles but remember the story of St. Thomas, one of Jesus’ disciples who refused to believe that Our Lord had risen from the dead? Our Lord came to Thomas, instructing him to put his hands into Our Lord’s Wounds. To which Thomas said, “My Lord and My God”.
And Jesus answered:
"You believe because you can see me. Happy are those who have not seen and yet believe."
And, so it goes. There are things we don’t see or understand about our Faith - things that defy human explanation such as the Immaculate Conception, the Virgin Birth, etc. Perhaps the though of being “filled with the Holy Spirit” might actually be easier to take. (Don’t you believe you’re filled with sanctifying grace after Holy Communion? Do you question that? Something we don’t see but believe.) But taking Our Lord’s (God’s) Word for it (THE Word) - we, as Catholics, believe. It may be difficult to understand - but we accept - and we believe.
And that’s what makes us who we are as Catholics.