Why do I still worry...

when faith comes with a Worry-Free Guarantee?  It would be so much easier if I would just lay all of my problems - both real and imagined - in God's Hands and let them go.  Easier said than done.

25 "Therefore I say to you, do not worry about your life, what you will eat or what you will drink; nor about your body, what you will put on. Is not life more than food and the body more than clothing? ²⁶Look at the birds of the air, for they neither sow nor reap nor gather into barns; yet your heavenly Father feeds them. Are you not of more value than they?
  ²⁷Which of you by worrying can add one cubit to his stature?
  ²⁸"So why do you worry about clothing? Consider the lilies of the field, how they grow: they neither toil nor spin; ²⁹and yet I say to you that even Solomon in all his glory was not arrayed like one of these. ³⁰Now if God so clothes the grass of the field, which today is, and tomorrow is thrown into the oven, will He not much more clothe you, O you of little faith?
  ³¹"Therefore do not worry, saying, "What shall we eat?' or "What shall we drink?' or "What shall we wear?' ³²For after all these things the Gentiles seek. For your heavenly Father knows that you need all these things. ³³But seek first the kingdom of God and His righteousness, and all these things shall be added to you. ³⁴Therefore do not worry about tomorrow, for tomorrow will worry about its own things. Sufficient for the day is its own trouble." (Matthew 6: 25-34)

Now that is a seriously great worry-free guarantee!