Medication are for many things but I need to understand your problem in detail

Yes dear! Definitely treatment is there! The age which you mentioned is the age when most of your identity starts getting established , start of the career , may be start of new relationships! Many things needed to be considered at this age. I understand the amount of conflict which is happening inside your mind and body as the sentence description itself says . It might be very difficult to handle two different conflicting feelings at the same time and to act appropriately. And sometimes ending with feeling of getting hurted. Whatever it may be , rather than labelling it as personality disorder, start looking at it as a difficulty in handling the situation. Rather than two persons , they are conflicting thought processes. I strongly feel that , seeking help with psychiatrist or psychotherapist will definitely help you out.