Answer :
Answer: It is not mandatory to 'feel' the emotion you are trying to display, while it would make it more flamboyant to try and feel it, and it would also add another level of emotion to the sign.
Explanation:
Facial expressions are a part of the ASL language. You can use ASL without facial expressions, but it might make the interpreter confused if you are trying to tell a story or describe size and shape. Facial expressions amplify or simplify the emotion you are trying to emphasize. While you don't have to feel it personally, it would make it much more fluid and beautiful to add or try to feel those emotions, ESPECIALLY in storytelling.
Have a wonderful day, I hope this helps.