Hey, I'm glad you got a social one on the first try! They all usually turn sweet after a year, but mine first bp had a lot of... personality. The biting kind of personality.
I have a friend who self-injures. Even when he's getting help and is doing okay (he's been doing mostly okay for several years now), he still does it annually on certain painful anniversaries.
(I have chronic depression, too, but it's not the self-injury type. Just the lying in bed unable to focus on anything kind. Weirdly, the only time I ever thought of cutting was when I started on medication several years ago.)