What is the God you believe in like? Is your God full of warmth, love, and compassion or is the God you believe in a monster of vengeance and judgment? Listen to how the concept of the Trinity may help you relate to God a lot better than you do now.
Do you want to have an honest relationship with God? Then you are going to have to learn to express all of your emotions to him including anger. The Bible has many startling verses concerning this.
You must be completely honest in all of your dealings with God. That means expressing your anger to him at times. If you don't do this, then your relationship will remain shallow. Listen how I learned this the hard way.