My first thought was that it's proabably a good idea not to tell everyone, for the exact reasons you listed. My second thought was, how sad that we feel like we have to hide this from others. I too, kept is from most people until after my surgery. Then I did tell everyone and I regret doing that too. It's hard because we want those around us to share and support our experiences, but that's not how it always ends up.
You may be making the right choice. Stay positive. Until those people have walked in your shoes.....