I did not mean to suggest any diagnosis. I agree that dbt skills are useful. Here are the four basic categories:

Mindfulness; Interpersonal Effectiveness; Emotion Regulation; Distress Tolerance.

I was thinking specifically that ideas for distress tolerance might be helpful.

Note that "group therapy" within dbt is really akin to a classroom setting in which the skills are taught and reviewed.

I certainly agree that you have cause to be angry with the abuse and neglect they have consistently given you. You did not deserve any of it. As I said above, many of us here wish we could have protected you and still wish that.

Resorting to SI during times of overwhelming pain and despair can be understood. I look forward to better circumstances and to healing through time, therapy, support, and separation, so that the searing desperate pressure to SI will gradually wither away.