God is not a sad God; He's a happy God who wants you to be happy too! The Bible says, "Happy are the people whose God is the Lord" (Psalm 144:15). This is the whole point of salvation, to relieve us of the suffering, pain, death, and tears brought into the world by the Devil and the sins of man. God is not a monster who's trying to deny you everything and make you miserable. He loves life and created it for you to enjoy. He made this beautiful world as a home for you to live in and enjoy, and He gave you a wonderful body, mind, and heart with which to enjoy it. He even promises you the desires of your heart when you delight yourself in Him (Psalm 37:4).
But God's pretty smart and He knows that the happier you are, the more you'll love Him, the more obedient you'll be out of pure love, and the better job you'll do for Him in sharing Him and His love with others. He wants to make you happy with His love, and He wants to help you make others happy, too, with both His love and your love. Our main purpose in life, as Martin Luther (1483-1546) said, is to love God and enjoy Him forever—and I might add, to try to help others to do the same.