Emotional people often want you to share your feelings but they cant really handle it if they dont like your feelings. Its kind of like the question of "Does this dress make me look fat"? Now if you are a thinker you might be rather blunt and awnser honestly but this question is not asking for honesty. It seems the "Share your feelings" is not really a request to share your feelings, its more a request to act more emotional then you normally do. Which if you are more the rational type, acting emotional might be harder for you to do. It seems that a lot of times this has nothing to do with YOUR feelings.