How can I "know" God?

<sigh> A difficult question...but interesting to ponder.
I know I tend to think of God as a sort of invisible friend with whom I always seem to be conversing.  I have this ongoing talk going on in my mind, I talk to God a lot each day.  I guess some might consider it praying, but I really considering praying to be different.  I learned that in a "prayer" we are to first give ADULATION and then CONFESS our sins, and then give THANKSGIVING, and finally SUPPLICATIONS (asking for various things).  I remember this order using the acronym ACTS.
But I have a different conversation in my head with God each day and I can feel Him gently directing my thoughts, I feel my heart convicted when I move in the 'wrong' direction and I feel comfort and joy when God knows I really need it.
I also tend to see the Bible as a sort of pen-pal letter from my God.  He wrote me a whole BOOK of notes or letters.  I remember many bits and pieces but have never memorized it fully.  So, I read it over and over, to hear the words of my friend, God, often.  He tells me so much about Himself in the Bible - after all, the Bible is THE STORY of God (it's called a "metanarrative").
I suppose that is how I attempt to know God each day, I really try to remember all I've learned from my past and keep learning each day from my Bible and from all the different people around me, the events around me, the world!
:-)
jules