Thanks for asking this question. I have learned a lot from this thread also. And I never knew that biting was used by so many of us. I thought I was alone in that too. Then, before finding this site and some others around the same time that had some basic info on self-injury, I thought I was alone in that too. But it isn't nearly as rare as most people think.
Another thing I want to talk about is your comment that you don't think that biting is that bad. No offense here, but let's just look at that, ok? I guess we could compare SI methods and sort them according to how bad, or severe, the damage is, or something like that, but I'm not sure it really matters, and there would be a range from slight to serious or even life threatening for just about any method. The other thing there is that one can feel "bad" about self-injuring, but that isn't helpful no matter what the method is. Hurting yourself does not make you bad. It just means that you are hurting, and you are coping with your pain in the way that is working for you. There are more effective ways to cope, like talking about what is bothering you, recognizing your feelings, and doing something to change the situation, but it takes some time to learn and to change. I know it is hard, but please don't feel like you are bad for coping the way you know how to cope. Therapy should help you to learn better solutions. It's not a matter of good or bad though - just about you getting the most out of life that you can.
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“We should always pray for help, but we should always listen for inspiration and impression to proceed in ways different from those we may have thought of.”
– John H. Groberg