If our universe was the size of a peach, what surrounded it? The universe is everything that is, even the nothing in which somethings float. The size of a peach in a cluster of peaches? Then that peach is not the universe.
It would have to be surrounded by fuzz.
Physicists have been talking about our universe being just one of many universes in a multiverse. That’s how they get around what’s outside our universe and why it started at a finite time in the past(13.8 billion years ago). Other universes may be older or newer. Basically they kicked your question down the road to be solved later.
Exactly what I was thinking? Where was this peach to begin with?-)
Your question is not meaningful. You're thinking in 3, maybe 4 (space+time) dimensions.
It's like asksing, "Who made God?" That's another question that assumes 4 dimensions.