In general, their membership lists are not made public to anyone. Different groups adopt different policies for the security of members. Usually you will be made aware of their security practices when you call. This is a common concern with all support groups, so don't hesitate to ask. Won't it just go away.
Many people deny the desire to crossdress for years.
Denial is a safety mechanism which works, but not in the long term. Crossdressing may be hardwired into the brain. It will not go away. Unless you face your feelings, denial will cause frustration, anger, and depression. You may not be ready to join a support group, but for your own good make a phone call and learn about the opportunities available to help resolve these conflicts.