mind abnormalityInner Aspects of Borderline Personality Disorder: A person with borderline personality disorder or mentally shaky personality disorder is exclusively relying upon peer influence. Above all others, those with this particular circumstance are more likely to peer pressure and easily manipulated by peer influence. I can offer several example cases as to why I assume it is driven by an human being's need to nourish off acceptance. For one, the whole thing they do is wholly based on that fact. Which is why they often times resemble that of Sociopathy, Psychopathy, Antisocial Personality Disorder, and even Manic melancholy. They will swiftly convert to anything that is considered to be the "acceptable norm.
Handy Online Medical Dictionary