Here is a great quote by Ken Legg

Dear friend, you may feel dirty, crumpled and downtrodden, due to what life has done to you, or even because of some of the decisions you have made yourself. But whatever has happened to you in life is not, in any way, a true indication of your worth. 

The question regarding your real value was settled on a hill called Calvary, two thousand years ago. There, your Creator became your Saviour, and paid a price that no one else could possibly have paid for you. Peter said, “…you were not redeemed with corruptible things, like silver or gold... but with the precious blood of Christ, as of a lamb without blemish and without spot” (1 Pet.1:18&19).

That’s your value.  You can show to the world that you know your true worth by allowing God’s glory to shine through you. Paul says, “For you were bought at a price; therefore glorify God in your body and in your spirit, which are God’s” (1 Cor.6:20).