why can't i trust?

serious. its so hard for me to trust. to trust that God is watching out for me.
its weird because i have seen him provide for me so often, and i know that the relationship i have with him can only be strengthened if i trust...
but still, im scared. scared for the future, for next week, for next month.
i dont know whats around these corners ahead, and i am having a tough time
dealing with that.
God, i want to lay my life at your feet, give you total control. but something is holding me back. help me.