I think i have borderline personality disorder. how diagnosed?

By seeing therapist: Best way to know is to see a psychiatrist or therapist to examine what's happening with you; they can help clarify. Bpd can overlap with bipolar disorder, depression, anxiety, & eating disorders. Some features: unstable, intense relationships; efforts to avoid abandonment; identity disturbance; impulsivity; suicidality; mood instability; chronic emptiness; inappropriate intense anger; dissociation.