When I initially saw this Will Smith video, I flashed on past students who were talented and rested on their laurels (i.e., skated by and didn't practice) and those who were fond of the phrase "It's hard" or "I can't." As author Richard Bach once put it, "Argue for your limitations and, sure enough, they're yours."
Do the work! Practice diligently! Embrace the music and own it! Sing with your own voice rather than imitating someone else! Become the best you can be for your own sake and revel in the joy of being the best you!