A man told his minister he was worried because he didn't feel he loved God. The minister replied, "I nurse my baby, although he hardly knows anything about loving me! If I'm depressed, he doesn't lose any sleep! If I'm in pain, he still smiles! If I sacrifice everything to feed him, he never thanks me! But I don't wait until he does something worthy of my love, before I love him!"
Instead of thinking about your love for God remember His love for you. The Bible says, "This is love, not that we loved God, but that He loved us." You'll know you love God when you want to obey Him. [1 John 4:10 and John 14:21].