Matthew 6:26

Look at the bird of the air; they neither sow (seed) nor reap (the harvest) nor gather (the crops) into barns, and yet your heavenly Father keeps feeding them.  Are you not worth much more than they? And who of you by worrying can add one hour to (the length of) his life? 

The word of God can change our vision of ourselves, our future and remind us of our value.  We first need to change our thoughts and we do that by studying and believing the word.  The believing can take time and we all may struggle until the word of God becomes bigger in us than the doubts.  Don’t give up because God is on our side.