Winged scapula? weak serratus anterior or damaged nerve?

my right scapula is slightly winged and i read that its either because of weak serratus anterior or damaged thoracic nerve, but im not sure which one because all my muscles feel fine and the right side of my body is stronger than my left. i can move normally and flex all the muscles around the scapula area. is my serratus anterior just weak or is my thoracic nerve possibly damaged?