I can't seem to pray for myself. I feel as if every thing I would say smacks of either subtle pride (Lord, lead me to the great works I am capable of...) or hapless incomprehension (Lord, let me get this job, or do that thing, if its your will, which I have no reason to think it is...or isn't). I feel better about praying for others, which maybe is a hint.
Also, perhaps it represents progress. I used to think that I knew how to pray, that I prayed apt, godly prayers. Perhaps realizing I don't have a clue what I'm doing and that I often shouldn't open my unclean lips is a sign of growth.