Trusting in God can be difficult sometimes! I know I've asked him in the past a lot of questions when things aren't working out the way I'd like, or I see pain and suffering in the world. Those times can cause you to say "Hey God what's the plan here?" Is He listening? Does He have a plan?
That's where trust comes in. We have to learn to let go of the things we can't control, and give those things to Him to manage.