PLEASE have your parents, or someone, take you to the doctor as soon as possible! Borderline personality disorder is one thing, but I don't believe that blackouts are a normal part of that condition. The fact that people are telling you that you often become violent during a blackout should send up a massive red flag! You need to have a very thorough examination to determine what is causing these blackouts and you need to have it done NOW!
Please keep us posted, OK?
Peace
Greenlydia