Feeling kind of Blah

Truly trusting in God is not an easy road. To give everything to him and to trust him with every detail of your life is, well, kind of scary.
On one hand I truly believe that God has called me to this place in my life, but then the other part of me says OK where is the money coming from. I am suppose to be the provider and now every days is depending on God to provide. It is not to far away from being just that, like the Israelites in the desert and God provided each day what they needed, and they grumbled because they didn't have what they wanted.
Notice I said they were provided what was needed but they became unhappy because they didn't have what the wanted.
Contentment is a very tough thing, we live in a world where more is better and the idea that he who dies with the most toys wins. I look around and see just that, people with more house than they need, more cars than they need, more stuff than they need, the latest gadgets, and more and more and more.
I find myself like the Israelites unhappy because of what I want, not what I need because God is providing.
Deciding to truly follow after what God has for your life means going through times of learning to trust. But why is that so hard when we know that He is a Big God, and that He can, and has, and does do Big Things.