God asks us to ask him for the things we need, yet he already knows what we need before we ask him. (James 4:2, Matthew 6:8 for example.) This seems paradoxical. Yet, God's desire is for us to partner with him; not because he needs us, but because we need him.
When we pray, we are partnering with God. Prayer helps us join in God's mission and will. We see this in Genesis with guys like Noah, Abraham, and others. How about the partnership with Moses in Exodus? Nehemiah? The disciples in the Acts? God brought his people into his plan for their own good even though he did not need to. Even today, God brings you into his plans as a partnership for your good. But it is important to remember that this is the most unequal partnership we could imagine. We bring nothing to the table and God brings everything. It's almost shocking that we hesitate to partner with God.
Prayer is entering into a partnership with God. Be praying!