Prayer is a two-way communication
Like I said, it is not what I tell God that it is the most important thing in prayer; it is what God wants to tell me. I will explain why it is so. Is there anything you can tell Him that He does not know! Is there anything at all? He knows everything. You may think that nobody knows what you are going through and that nobody knows the problems you have and how hard your life is. That may apply to people, but not to God. God knows everything! Even before you start praying, God knows everything you may want to tell Him. God also knows why these things are happening to you.