Professionals cannot tell someone whether they are TS or not. Professionals can only be guided by a patient's self-reporting. Also, professionals are or should be trained to rule out major conditions other than dressing for sexual gratification, such as bi-polar, depression, etc, that once treated might lessen GID, but even then, professionals are not infallible. Ultimately the only source for answers is within the patients/clients themselves.
People seek professional validation because it provides the "medical justification" defense.
"Never forget the many ways there are to be human" (The Transsexual Taboo)
The crossdressing community is one that needs to stick together and continue to be there for each other for whatever one needs. We are always trying to improve the forum to better serve the crossdresser in all of us.