Hey hun,
you can't be too borderline for DBT

DBT was created firstly for Borderline clients, although I think it's now used for other conditions also.
Plus you are..you! You're not just a borderline! You are a unique person with her own issues, her own positive and negative points, her own talents etc Your more than just a label or a diagnosis
Keep the words in your head that your therapist said to you - she isn't going to give up on you and she isn't going to quit! If you were too much for her to handle she wouldnt say that..would she?
(((((hugs))))))