Hi Karen, I think that if you, through your therapy, feel you need to continue with starting hrt, it is something to discuss with your doctor. I myself started on a low dose and my anxiety disappeared, I calmed down and I felt happier. But for me, the physical changes came also.
If ymmv holds true, it boils down to your genes. If you do start and physical changes do occur, all I can do is give my experience that after 8 months there have been changes, but none so dramatic that anyone that sees you often would recognize them.
But like I said, your mileage may vary.
I strongly agree that you should not lie to your children, but gauge with your experience when is the right time.