Yup that's right God doesn't need you.
He WANTS you. He longs for you. He desires you. It's a game of love and He's saying "wanna play?"
C.S. Lewis says it best:
God, who needs nothing, loves into existence wholly superfluous creatures in order that He may love and perfect them... If I may dare the biological image, God is a "host" who deliberately creates His own parasites; causes us to be that we may exploit and "take advantage of" Him. Herein is love. This is the diagram of Love Himself, the inventor of all loves.