Ephesians 1:4 - Even before he made the world, God loved us and chose us in Christ to be holy and without fault in his eyes.
What I do understand is that God did choose us. There is no way that we chose Him. Even before the creation of he world, God chose us as His people. We were selected to be His family and partake in Christ's salvation.
My understanding is that every person that was created is chosen, otherwise they wouldn't be created. But then the choice is left up to us whether we want to accept Jesus Christ as our Savior and partake in the good news of Christ or to disregard the whole Christian faith as garbage.
If we look at 1 Corinthians 1:27-30:
The world, we know is evil and we are apart of this world. So I can understand when Jesus says that He chose us out of this world....but the big question is...what about the rest? What about other people?