The world in 2 Cor 5:19 isn't condemned, no sins charged to it. The world of 1 Cor 11:32 is condemned for its sins charged to it. Its impossible for a condemned world to be the world Christ died for.What is it about John 3:16-20 that you don't understand?
"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life. For God did not send his Son into the world to condemn the world, but to save the world through him. Whoever believes in him is not condemned, but whoever does not believe stands condemned already because they have not believed in the name of God’s one and only Son."
If you believe then you are saved. When the final judgement comes then those who haven't believed are condemned.