I was taught in catholic school that the entire bible was strictly literal as in everything in it happened exactly as it is written and it’s a history book. This is, I’m sure you know, not remotely the catholic church’s position. Another of my catholic school religion teachers was a creationist, which again is not the church’s position. I’m thinking whoever taught you misunderstood, since part of transubstantiation is that no outward characteristics are changed, only the “substance”. Any halfway intelligent priest would think you’re crazy for thinking it’s literally human meat and human blood because it specifically isn’t. The whole thing is a deliberate nonsense contradiction but I’ve never met a catholic or a priest that would take that interpretation at all seriously.