It is good that you are becoming aware of problems while very young. You have a lot of time to make significant changes and decide what directions you want to go in, in different areas of your life. Hopefully you will be able to make things work out with your significant other, but even if you do not work it out with this one, it can get better as you date different people over time. The most important thing obviously is you and developing your own self-esteem and sense of identity.
LostNVegas,
That must be very difficult having your sister with scizophrenia at home. My father was borderline psychotic (and physically abusive to me), and as long as he was around it was a horrible atmosphere in the house and very difficult to make progress on anything. Maybe your sister is different, but having someone who's that ill around has to be challenging - I'm sorry to hear about that.
You might be interested to know that psychoanalytic therapists also developed therapy that fully cured schizophrenia, but it's very little known today. There is a great recent book about this, Rethinking Madness, by Paris Williams, which talks about 6 schizophrenics he worked with who fully recovered. My favorite book on schizophrenia is The Infantile Psychotic Self and Its Fates, by Vamik Volkan. Volkan treated schizophrenics in intensive treatment 3-4x per week, and (according to the outcomes of patients who he followed over many years) cured or greatly improved 90% of them. His case studies are fascinating. Weirdly enough, you can actually learn something about BPD from reading about treatment of schizophrenia.
Something I've realized since coming on these boards is how little access there is to intensive therapy. One thing that I was very lucky to have is my parents' support in going to therapy (psychodynamic) about twice a week for several years. I wish everyone could get access to that. It is possible to recover without therapy - for example, Clare, writes about how she fully recovered from BPD alone here - http://tacklingbpd.com/ - but IMO it is very helpful if you can get good therapy.
From my reading, there used to be much more access to affordable therapy - i.e. therapy that affordable insurance would pay for - in the 1950s, 60s, and 70s, before my birth. However, then (in America) in the 1980s and 90s Big Pharma and managed care came to dominate the scene, and more and more mental health conditions came to be treated in short-term therapy and/or with medications. That has obviously affected how Borderline Personality Disorder is treated. It's too bad because our society would actually save money and reduce suffering if more long-term affordable therapies were offered for BPD. The short-term/medication approach is just not as good IMO.
I like to think that even if someone doesn't have a lot of money, that if they are persistent and motivated they can find a good therapist who knows how to treat BPD, who will offer lower-cost (sliding scale) therapy. It is good that there are these new DBT programs that are helping people cope and improve in managing their symptoms. I never did DBT, so really cannot speak much about it. However, I am a bit doubtful about DBT as a long-term solution, because when I compare it to my experience of doing psychodynamic therapy for BPD multiple times a week, it seems it might not be as deep or do as much to help me to understand my historical problems. But given my lack of experience with DBT, I must admit that I could be mistaken about that, and if DBT does help to people to recover, then great.
Something I want to emphasize is how much it helped me to study BPD from an object-relations standpoint - meaning understanding how neglect and abuse (a predominance of unsatisfying versus satisfying experience) leads to severe splitting, which creates the all-good and all-bad self and object groups of images, which (along with other defenses against bad feelings) cause all the 9 BPD symptoms. This process occurs almost in a mathematical way - the borderline individual is "attached" emotionally to all-bad images of themselves and others, and because of this attachment and familiarity (and the fear of loving, vulnerable relationships) they keep inevitably repeating dysfunctional patterns they learned in earlier years. The only way out is to accumulate enough positive relationships experience - meaning a strong enough internal set of good self and object images - to integrate the good and bad clusters/units and become able to tolerate ambivalence. Otherwise the good/bad units stay split and the borderline symptoms remain.
I don't know if that made any sense. But it was understanding the object relations basis of BPD that guided my behavior from my late teens. I realized that I had to form trusting, dependent, loving relationships with new people that were totally different from my abusive relationships in the past. As I did this, using my therapist, my mother, a few crucial friends, and my 12-step group, over a period of several years, I internalized enough support and love to become able to regulate my feelings, develop an identity, and to begin integrating good and bad self and object images. In the beginning, it was very difficult because I had no idea what I was missing, and all of these descriptions meant very little to me. But today IMO, the psychodynamic object-relations viewpoint on BPD is an almost-perfect model for how the disorder works underneath the confusing symptoms. It's like opening a car and looking at its engine.
I would be happy to talk with anyone more about the object-relations way of understanding the disorder. You can obviously tell that I enjoy thinking about it

LostNVegas, if you are ever looking for someone to do therapy with more intensively, you might also look at PsychologyToday.com's database of therapist. They must have some good therapists offering varying rates on treatment.