Prayer

This morning, I thought about "prayer".
When I meet a person first time, the conversation is very limited to asking some questions or talking about headline news.
On the other hand, I talk to close friends most of things and feelings.
Prayer is a conversation with GOD who is my savior, friend, and father.
Although I have so many things to talk to HIM, I don't.
Sometimes I just talk to GOD things, but I don't allow him to respond to me, by leaving the conversation.
I want to learn to talk everything to him first, and then wait for his response more and more.
What keeps me from talking to HIM?