Is Christianity ignoring the subconscious?

The commandments are pretty clear but what control do we actually have?

Matthew 6:

31 Therefore do not be anxious, saying, ‘What shall we eat?’ or ‘What shall we drink?’ or ‘What shall we wear?’ 32 For the Gentiles seek after all these things, and your heavenly Father knows that you need them all. 33 But seek first the kingdom of God and his righteousness, and all these things will be added to you."

And many more verses, this is just example.

How can someone decide not to be anxious? Im sure every anxious person would like to stop being anxious.