No, "whosoever" is not everybody. That's basic English language comprehension. The rest of your commentary on John 3 is inapplicable.
The words "world" "all" and similar words are often counterbalanced in scripture, either with other words such as "many" instead of "all" or through comparative analysis of words in language structures and the history of language usage, so that "world" can have local meaning, international meaning (the earth) or universal meaning which would be the universe itself completely.
By comparing scripture as a whole, we come to understand that when Jesus said "the world" he was referring to the kingdom of darkness that is ruled by the Devil, and we also understand that people go to hell by the decree of God, that the word "whosoever" does not meaning EVERYBODY EVER, and there is no reason to even think it does. You might be confusing the offer of the Gospel with the actual number of humans that accept it eventually.