Yasmin,
Sorry you are having to deal with this. The portrayal of borderlines as sociopathic and violent is completely without merit, and if someone is saying that you can be assured that they are an idiot!
It sounds like you have been unlucky to be exposed to some negative portrayals of BPD from people who don't understand the condition. The reality is, people with BPD are in great pain and are trying to manage the best way they know how. They are usually not violent at all; rather, they just want help and support buy have trouble asking for and accepting it.