Not all Psalms are Psalms of praise but some are Psalms of lament, sorrow and grief in times of trouble with faith in God. Are you going through a rough time? Cry out to God. Pray Psalm 80. Meditate on the words. Other Psalms of Lament are Psalm 42, 60, 74, 79 and 85.
Text for Psalm 80 from NIV translation Psalm 80