john 3:16 and what is really says

John 3:16 "For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life. Now many people think that this verse talks about the WHOLE word. Now if we take the word “world” back to the Greek (κόσμος,n {kos'-mos}) it means “of the believers only”. Many people when they hear this, they will say. If it means “of the believers only” they will say that then there is no reason for us to witness to someone. But that is not true we must witness to them. The other thing they will say is that we don’t know who will believe in Christ, and I say this we don’t know who God has picked before the start of time. To be saved and who he has not that is why we must witness. Ok so let me put it this way, jimmy form the start of time was not picked to be saved so then john 3:16 would not be valid for him. But now we find Timmy and he was picked before the start of time to be saved at the age of 22. So now john 3:16 is valid for him. Now Timmy is only 19 right now so this means that when someone says “of the believers only” does not mean that it is for the sheep of this time but the sheep of the coming days, weeks, months, and years to come. Many people think that it means of the sheep this day right now. But as I said Timmy is 19 now and will be saved at the age of 22 so if this is true then “of the believers only” means for all sheep now and to come. So the Greek says for this verse that the word WORLD means “of the believers only, not the whole world