You are valuable not because of who you are, but because of whose you are.
What is it that makes you valuable? What makes you feel important? Is it your wealth? The fact that you're well educated? Do you feel important because you get lots of cell phone calls, so that must mean you're popular? Or do you feel valuable because you have a high position of leadership at work?
While it certainly isn't wrong to be wealthy, well educated, popular, or in leadership, we must not let those things define our worth and value, because things can (and likely will) fail us. Cars break down; houses burn down; profits sink down; and with them, our self-worth falls down.
But God declares that you're worth everything to him -- you're worth all Christ offered. You are not your own; you were bought at a price (1 Corinthians 6:19-20). That price is the life of Jesus.
You are precious in God's sight -- you're his child (Ephesians 1:5). Almost every parent would agree that his or her child is the most precious thing in the world; and that's the way God views you! It's no wonder God labels his people as his treasured possession (Deuteronomy 14:2).
Don't let wealth, education, popularity, status, or anything else define your value. Know that you worth everything to God, because you're His.