She has done what she could to anoint My body in advance of My burial. — Mark 14:8

David gives a two-part instruction: trust in God at all times, and pour out your heart before Him. Trust and honesty go together — you can't really trust someone you're hiding from. God is a refuge for us, not a judge to perform for but a Father to run to. So don't clean up your emotions before you pray; bring Him your raw heart. He can handle it.