As a kid, after first communion, I had a child’s understanding that Christ was in the bread and wine. Something about being a kid makes belief easier with such an idea.
Like many Catholics, I did not think about it much as I grew. Not analytic thought.
By the time I learned a bit of our theology and tradition, it was clear that at best, we are talking mystery. As with the incarnation. Sometimes people try to delve to deep into mystery. They have discomfort with it.
To me the real presence is as reasonable as the reason of classic Theism.
Why do we exist at all, and moment to moment? We do! So there must be an explanation. Metaphysical truth yet mystery. A being sustaining everything, transcendant and imminent, is really not so hard to imagine present in the bread and wine.
We also believe in the Divine Indwelling. Mystery again, but it seems recognised in our catechism manifesting as that voice of conscience we all experience. ( That voice remains real yet outside of the grasp of science and explanation) When we receive, I have heard it described as presence meeting presence.
A Catholic should expect experience of such a thing does not lend itself to words. And that’s OK. If this helps, I think the imminent and transcendant aspect of God in the universe gives the real presence background. The passages in Colossians 1:15-17, for example remind us vividly of just why the incarnation is mystery. It isn’t an absence of an explanation, it is simply beyond our ability to grasp. The irony is you learn you have less than a child’s grasp.