>>> If you have trouble wrapping your head around the concept of infinity and a universe that is expanding “into something”
Suppose you lived inside a balloon. As the balloon inflated, how could you imagine what outside space it expands into.
That's my problem. There must be "something" into which to expand. So what's it expanding into? If it's expanding into a "void", then the void itself is something. In your analogy, what is the balloon floating in? I'm starting to think it's a parallel universe and we are encroaching into that space.