Carrie,
That was just a statistic I saw describing typical self injurers, although it also said that there aren't truly typical self injurers as there are always those that don't quite fit the pattern. I'm sorry that you feel bitter about it. I understand that, and maybe it means that you want to (and maybe are getting ready to) stop?
I have to admit that I am unrepentant about it at this point (although afterwards I am embarassed and feel bad for my husband because it bothers him so much), and I would do it again if I needed to. It bothers me that the scars from last time (February) have faded more than I wanted them to, so I will likely be looking for a reason to do it again.