"Glory to the Father, and to the Son, and to the Holy Ghost; as it was in the beginning, is now, and ever will be."--Gloria Patri, a traditional Christian hymn
The Gloria Patri, an ancient hymn, contains a good reminder of the fact that God does not need us. It provides us with a chance to laud our Lord, but focuses on the fact that God has been glorified since time began, and will be glorified long after we live on this earth. He doesn't need us to glorify Him. What did Jesus say? If we are silent, the very rocks will cry out glory to God. If we stop glorifying God, our lives may lose their meaning, but God will not lose His glory.
This shows God's love on the Cross to be amazing. The Gospel is not a "God scratches our back, we scratch His" kind of thing. He needs no one to scratch His back. But, regardless of His perfect state of glory, He decided to love us and give Himself for us. Through glorifying God, we can live fulfilling lives. We praise Him because we need to, not because He needs us to.