That's pretty wrong, imo.

A gynecologist has no business doing what you described. 15 is too young for a diagnosis of a personality disorder (I'm assuming she only suggested it, hence 'label'). My mom noticed superficial cuts on my wrist when I was in sixth grade and threatened to have me stripped naked and thrown in a padded room (to this day I wonder why people think scary and mean is helpful).

I don't know where you live, but over here to to be thrown in an insane asylum for that is a gross exaggeration and makes it sound like she had malicious intent (sometime unstable people project onto other people or even become therapists and doctors) . Under and over diagnosis are a big problem, and in my own experience and what I've read online, some doctors and psychologists are "trigger happy" to throw around labels like this. I've had several people at the drop of a hat diagnose me with things without proper evaluation which later proved to be wrong. Borderline personality disorder is sometimes strapped onto to people for various reasons that have little or nothing to do with it. In some minds, being a socially anxious teenage girl who has been suicidal would make you a prime target.