A self vs God-centered prayer

Normally I like learning something new.  Yesterday was one of those moments when I felt guilty for discovering something new.  It happened when the pastor was going through Isaiah 38.  This is a passage where Hezekiah prayed to God when he was ill and then God gave him 15 more years of life. After reading the whole chapter, the pastor immediately talked about how wrong the prayer in verse 3 was, because unlike in the previous chapter where Hezekiah was putting God in the center and on the throne as he prayed for delivery, this prayer was all about how Hezekiah did what was good in God's eyes and hence God should be remembering and healing his illness.  

I had to admit - I was quite taken back.  I DID NOT THINK ABOUT THIS AT ALL - even though it seemed so obvious now that it was pointed out.  I kept thinking that wow, the fact that I completely missed this point about prayer means that probably my prayers haven't been that God centered either.   To me it's sometimes almost mechanical to separate my prayers into ACTS (more often than not heavier on the T and S parts) - but I don't remember when the last time I prayed because I was so in awe of God's Sovereignty and Glory.  This is alarming!  
My current goal, given my new "discovery" about myself, is to explore more heavily the topic of prayer in the next few months - and I trust that God will continue to reveal more of Him to me, and help me to focus on Him more!