Self-injury isn't a cut and dry issue for mandatory disclosure. If you are underage, your counselor may be required to inform your parents if you are in danger and they need to intervene. But a good counselor will tell your parents that your privacy is important to you and essential to your treatment, and will ask your parents to respect your privacy. If your parents insist on having access to information that isn't essential for them to have, or that you don't want them to have, a good counselor will help you to talk to them about it rather than just tell them behind your back.

There are exceptions too, such as for very mature teens, or if your safety would be jepeordized if your parents had access to the information. When you start therapy, talk to the therapist or counselor about confidentiality and disclosure, and find out how they deal with those issues. They will try to help you in any way that they can.