This is even more noticeable in young Fe users who are unsure of how to act until they know all the information.
Also from Lenore Thompson:
All that could easily cause social anxiety. Then of course there is personal experience, which is not as reliable, but given the lack of evidence for the theory, personal experience may as well play a part....in short im obviously big on Fe, but I feel socially anxious very often.Young EFJ's can be surprisingly awkward in social situations, particularly when compared with the more outgoing Extraverted Perceiver's. Until they know how to gauge people's expectations well enough, they're self-conscious and reluctant to take action.
Although I agree with what you said about Fi.