How to put God in a box

Do you impose limitations on your god? Do you have an image of your god that is incorrect? Do you make your god into the god you want him to be instead of the one that he truly is?
I do it all the time and I call it putting God in a box. I make my God small by not trusting in His greatness and provision. I make Him into an angry God when I am suffering from extreme guilt over a sin I just can not conquer on my own. I worry about my finances as if He couldn't and wouldn't provide for my every need. I stress out about things that I have no control over....but He does. I see God as an angry father figure pointing down at me with an accusing finger (picture the image of the Sistine Chapel)instead of the loving God that died on the cross for me. I put conditions on my obedience and faithfulness to a God that is ALWAYS faithful in keeping His promises. The Bible is filled with God providing for His children. It is filled with God's love for His people. It is stuffed with the image of God's grace in the form of Jesus Christ.
He tells us over and over again, "Don't worry, I am here for you." Even the name He gives Moses for Himself, "I AM" speaks volumes of His greatness and providence. He tells Moses, "Don't worry, I will be there for you." And then guess what....He was there for him. He tells Joshua, "Don't worry, I will be there for you." And then guess what......He was there for him. He tells His people over and over again all through the Old Testament not to worry or be afraid. And guess what happens.....His children/people/prophets all worry and stress about things and put constraints on an uncontainable God. This usually corresponds to a season of incredible trials and hardship before they finally get it through their thick heads to trust God. And once they trust God guess what happens......things turn out just as He said they would.
With all these clear examples in the Scriptures why then do we (I) keep doing the same thing to God? Why do I not trust Him with all of my heart? Why do I lean on my own understanding of things instead of leaning on His irrefutable control over all things? This is the God that put that beautiful crescent moon in the sky for me to look at on my way to work this morning. This is the God that spoke things into being. The God that made 1000 species of trees in a 1 mile area of the South American Rain Forest. This is the God that made a caterpillar's head contain 246 muscles. This is the God that keeps my heart beating and my lungs filled with air and my liver and kidney's functioning without me having to think about it. This is the God that made the incredibly complex human brain. Why then can I not use that grey matter to do what is right in the eyes of God and not put him into a small box of my own making?