I hope you're not a troll :trollface:.
You just can't play music without feeling .. maybe your teacher wanted you to play more involved into the piece (not mechanically stumping on and pressing buttons like a robot or a bored student).
Your feeling is your internal state and it can be conducted via the activity you perform, especially like playing music.
Music is all about feeling, so when you play music you always feel something and it is better to be constructive with this at least regarding to the piece you play.