David says "my" eight times in the following Psalm as he expresses simple, childlike faith in his relationship with the Lord.
Psalm 18:2 The Lord is my rock, and my fortress, and my deliverer; my God, my strength, in whom I will trust; my buckler, and the horn of my salvation, and my high tower.
The Lord supplies everything David needs for the battles he faces. God is his everything. God can be our everything if we let Him.