Therapists are committed to your privacy, so sharing your personal information is a rare occurrence.
There are two exceptions. The first is if your therapist were to become aware that you are an imminent danger to yourself or others, or that someone else is a danger to you. You would first be encouraged to seek necessary support, and if you were unable or unwilling to do so your therapist has a duty of care to seek this support on your behalf.
The second exception is if your therapist were to become aware that you intended to commit a major crime of any sort. In such a case they have a legal obligation to disclose such information to the relevant authorities.
*Note that for the purposes of therapy, personal drug use or addictions are not considered to be criminal activities (unless they involve anyone underage). They are seen only as areas to be addressed in therapy.