I am a stealth procrastinator. My friends/acquaintances have always regarded me as "the responsible one," and very dependable, but I'm always avoiding the things I don't want to do. It's weird, because I worry nonstop about things until I have finished them and/or have found some sense of closure (like, okay, I think my grade on this essay/project/whatever will be adequate to maintain an A; or, I think my boss will be satisfied with this work), but I seriously, seriously put things off much longer than I should, in my personal life and in work.
I'm probably worse at putting social things off, however. With school or work, I know I have deadlines, so I'm better at finding a little structure. With communicating with my friends or family or whatever, I don't always get around to doing what needs to be done. I might put off responding to something as simple as a text message or a Facebook wall post for a week or two, and then I feel like responding would be stupid (great, once I finally think of the perfect response, right?). I'll put off calling a friend and asking them out to lunch or to see a movie, even if I know they'll agree to meet me. (This is one I, frankly, don't get. I know my friends want to hang out with me, but for some reason, I am always, nonetheless, afraid they will say "no." Irrational fear, much?)
Perhaps having an avoidant personality is the INFJ thing in this situation and whether or not it's work/play depends on what is most threatening or unpleasant or _________ to the individual. Don't we try to avoid conflict by finding common ground with those we disagree we? It's not that much of a stretch to say it could carry over to a trait like this.