Psalms 6:6 I am worn out from my groaning; with my tears, I soak my bed and drown my couch every night.
The psalmist knows long periods of waiting and suffering. It does not stop him from praying, because he knows that only God can change his situation. He does not know when the answer will come.
Such prayers are not signs of defeat. A faithful prayer life over long periods of waiting is a victory in itself.