1 John 4:19 says "We first love Him because He first loved us."
If God chose you before the foundations of the world, that means He chose to love you before you existed. In other words, you did nothing for God to choose you. He chose you just because He wanted you (nothing else).
Taking it further, if you did nothing for God to choose you, what would make you think you could do anything for Him to reject us because you don't always do what is right? God loves you regardless...no matter what!
Rest in this truth and receive it. Remember Romans 8:38-39 says, "For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, neither height nor depth, nor anything else in all creation, will be able to separate u from the love of God that is in Christ Jesus our Lord"