Hi @Amber8,
and welcome. I think getting a diagnosis of BPD can be a bit tricky, as many people have borderline traits without actually 'qualifying' for the disorder itself.
It might be more helpful to think of each problem or symptom you have and work on that particular problem with a professional, rather than worrying about a diagnosis. For example, if you know that you have abandonment issues, then work on exploring those and coming up with some strategies that you can use in your personal life when something goes wrong.
When I was in my 20's, I too felt like I had a few borderline traits, but I never told anyone about them. They were obvious to me, but I was successful at hiding them from others. I only discovered my BPD traits because we touched on BPD in a course I was studying at that time.
Years later, I suffered major depression, panic attacks, generalized anxiety and possibly some mild depressive psychosis. I didn't receive a formal diagnosis, even though I saw a psychiatrist regularly. I never asked her what my diagnosis was; we just talked about my various issues.
Are you seeing a therapist now for treatment? It might be helpful to go over all this with a professional. I would definitely mention that your sister has BPD, as it could be relevant.
Let us know how you go.
