Why was man created? There are a couple good answers to that question, but one of those answers is that the Lord wanted to. He just wanted to. He had a desire to show all his goodness and glory to a specific being, thus man was created. We were created because he wanted us and therefore we were designed to be the compliment of that; to be wanted.
So how does God fulfill that desire in us to be valued and wanted? Before the foundations of the world, God knew what he was doing. He thought up the timeline of the universe and how all of the events on this earth would take place. He was not taken by surprise when Adam sinned and humanity fell. Before time began, he had designed a salvation plan in order that we might see the greatness and glory of our Lord and know the the fullness of his love for us. And the climax of God's timeline was the crucification and resurrection of Jesus Christ. And that is precisely where we find complete fulfillment for our need to be valued. At the cross, I find all the value I could ever hope for.
Romans 5:8 - "but God shows his love for us in that while we were still sinners, Christ died for us."
What a great God we have! I was in a state where I was unlovable, where I had no value at all due to my sin. I had rejected the Lord completely and he would have had every right to tell me "I'm done with you." And yet, in that state when I had done nothing to be worthwhile or valuable, Christ died and showed me that I was valuable to him. Because I'm only worth what someone will pay for me. And Christ showed that I was worth his blood, not because of what I had done but simply because he valued me that much.
So my identity is found in Christ. And when I forget that all I need to do is return to the cross where I can see where my true value lies. Without Christ, I have no value at all. But in him, my created need for value and worth is completely fulfilled and satisfied.