If a buggy giuy in the fruit, it would have had to have pierced the skin of the fruit. In the time it took for that fruit to get across the country/world to the market and your home, that hole would let oxygen in, making a blemish or squishy spot. Most “ugly” produce will never see a store shelf. Some will get processed into other things so you won’t see it, but whole produce should be pretty bug free, at least internally.

As the other commenters said though, most is blasted to hell with chemicals to keep this from being an issue.