The song is wrong.
Joy does not come from putting Jesus first, than others, and then yourself because that makes my joy depended on what I do. When did my actions become the source of joy in my life?
"I will praise the Lord who counsels me; even at night my heart instructs me.
Joy comes from God.
From being in His presence.
Look at the word, even it illustrates the principle. Joy comes into us as we spend time in God's presence, fills our hearts, and is then flung out into the world - as if one hand is raised to God and the other outstretched to those around us.