How to determine if you have borderline personality disorder

There are nine diagnostic criteria for BPD. If you have five or more of the nine you can be diagnosed with BPD. Of course, a formal diagnosis is definitely best for personality disorders (which are typically not diagnosed before the age of eighteen in the United States), however, I know that's not always accessible to everyone, and finding a professional that is accessible, will believe you, will diagnose you, and will treat you, isn't always easy.