How does someone tell if a person has an INFP personality, or a personality disorder?

i am an enfp, according to myers briggs. if i matched myself to a personality disorder i would be considered highly histrionic and narcissistic. we all have certain traits of personality disorders, and it does not mean we actually HAVE one. personality tests are very controversial considering that they may only take mood and current situations into consideration. a personality disorder is usually considered when someone has pertinent problems with everyday functioning and/or comorbidity with depression or some other mood disorder. these are in fact, only diagnoses that can be made by a professional, if severe enough.