Thank you everyone! I think I get it now. From your descriptions I think I do CBT with my therapist. We work a lot on how thoughts influence behaviors, and how to accept feelings and thoughts and accept the fact that we can't change them. We have done some worksheets, and we tried mindfulness (but pretty much abandoned it when I told her it was unhelpful, although she occasionally brings it up), but we don't really do anything regarding "distress tolerance," and I've never been to group therapy (nor has my therapist suggested it). I also don't have BPD.