I'm using some type descriptions stolen from Wikipedia, because it's hard to differentiate between myself and something that doesn't have a coherent definition.
ENFP
ENFPs are initiators of change, keenly perceptive of possibilities. They energize and stimulate others through their contagious enthusiasm. They prefer the start-up phase of a project or relationship, and are tireless in the pursuit of new-found interests. ENFPs are able to anticipate the needs of others and to offer them needed help and appreciation. They bring zest, joy, liveliness, and fun to all aspects of their lives. They are at their best in fluid situations that allow them to express their creativity and use their charisma. They tend to idealize people, and can be disappointed when reality fails to fulfill their expectations. They are easily frustrated if a project requires a great deal of follow-up or attention to detail.
Enthusiasm isn't really my thing; life is pretty serious business for me; and I'm a huge perfectionist
INFJ
INFJs are conscientious and value-driven. They seek meaning in relationships, ideas, and events, with an eye toward better understanding themselves and others. Using their intuitive skills, they develop a clear vision, which they then execute decisively to better the lives of others. Like their INTJ counterparts, INFJs regard problems as opportunities to design and implement creative solutions.
INFJs are quiet, private individuals who prefer to exercise their influence behind the scenes. Although very independent, INFJs are intensely interested in the well-being of others. INFJs prefer one-on-one relationships to large groups. Sensitive and complex, they are adept at understanding complicated issues and driven to resolve differences in a cooperative and creative manner.
INFJs have a rich, vivid inner life, which they may be reluctant to share with those around them. Nevertheless, they are congenial in their interactions, and perceptive of the emotions of others. Generally well-liked by their peers, they may often be considered close friends and confidants by most other types. However, they are guarded in expressing their own feelings, especially to new people, and so tend to establish close relationships slowly. INFJs tend to be easily hurt, though they may not reveal this except to their closest companions. INFJs may "silently withdraw as a way of setting limits", rather than expressing their wounded feelings—a behavior that may leave others confused and upset.
INFJs tend to be sensitive, quiet leaders with a great depth of personality. They are intricately and deeply woven, mysterious, and highly complex, sometimes puzzling even to themselves. They have an orderly view toward the world, but are internally arranged in a complex way that only they can understand. Abstract in communicating, they live in a world of hidden meanings and possibilities. With a natural affinity for art, INFJs tend to be creative and easily inspired. Yet they may also do well in the sciences, aided by their intuition.
INFJs have vivid imaginations exercised both as memory and intuition, and this can amount to genius, resulting at times in an INFJ being seen as mystical. This unfettered imagination often will enable this person to compose complex and often aesthetic works of art such as music, mathematical systems, poems, plays, and novels. In a sense, the INFJ is the most poetic of all the types. Just as the ENTJ must lead, so must an INFJ intuit; this capability extends to people, things, and often events, taking the form of visions, episodes of foreknowledge, premonitions, auditory and visual images of things to come. INFJs can have uncanny communications with certain individuals at a distance. It is an INFJ who is likely to have visions of human events past, present, or future. If a person demonstrates an ability to understand psychic phenomena better than most, this person is apt to be an INFJ. Characteristically, INFJs have strong empathic abilities and can be aware of another's emotions or intents even before that person is conscious of these.
INFJs make outstanding individual therapists who have the ability to get in touch with the archetypes of their patients in a way some other types do not. As therapists, INFJs may choose counseling, clinical psychology, or psychiatry, or may choose to teach in these fields. Writing about these professions often intrigues an INFJ.
I'm not a psychic
Also, to the extent that INFJs 'use Fe' in a stereotypical fashion, I also really don't give a damn about wishing people happy birthdays
Also, that INFJ description seems more positive than it 'should be'