Hi, Erin! I'm Eryn! And welcome to Susan's Palace!
I'm really happy that you'll be having your first therapy session soon, I found my first session to be so incredibly validating and free! Best advice I can give with that is just be as honest and open about your feelings with them; keeping information from them because it's embarrassing, disgusting, or even terrifying will only serve to harm the journey you're on and your therapists place in it as a helpful entity.
Real quick with family. Basically all of mine accepted me, that of course, isn't the norm. But I think you should also think about how much they love you, as you love them. They might be skeptical, in denial a bit, or just plain confused- but I do think, as a loving family, they will accept you. And chances are, they always had a hunch(that was the case with some in my family)
I'm VERY curious what you mean about a mask? Are you referring to one figuratively, because it sounds like you actually bought masks and wore them. I have been using surgical masks while I practice my makeup skills, and that has allowed me to basically present 100% female full-time(minus the mask) People on Susans seemed surprised by this, and I guess its a more unusual thing that some of us do, so that's why I was curious.
I wish you the best on your journey, and definitely encourage you to rely on the know-how from ladies and gentlemen here on Susan's, and just mingle with the community!
Much love,
Eryn