Thank you for writing in with your question. Aside from the emptiness and self-harm behavior, I do not think you are describing Borderline Personality Disorder (BPD). There are identity issues with BPD, but it is usually instability of identity (changing frequently) rather than a “lack” of identity. Also, rather than feeling nothing, clients with BPD typically feel lots of feelings, but again, they fluctuate and can be extreme.
In personality disorder terms you seem to be describing qualities more similar to Schizoid and Avoidant Personality Disorder than BPD. However, your symptoms could also be accounted for by chronic depression and possibly social anxiety. Seeking the help of a mental health professional would not only be the best way to identify an accurate diagnosis, but also to begin the process of change. It is sad that you have no hopes and dreams and no close relationships. Yet treatment is out there and you are certainly young enough to discover and/or create these aspects of yourself. Life can be much more enjoyable than it has been thus far, but you have to yourself a chance to find out.
All the best,
Dr. Holly Counts