There are many wonderful reasons to go public about donating; for example, your story can indeed encourage others to donate.
On the other hand--based on accounts posted by LDO members over the years--reactions from friends and family can be unpredictable and disappointing. In my own case, I chose to tell almost nobody (save my wife, rabbi, and doctors) about my donation plans. I ended up having to tell my kids, my secretary, and my bosses, but specifically did not tell any friends or neighbors. I especially did not tell my parents, whom I was positive would worry before, during, and after the process. They might also be angry at my taking such a risk, when I have a family to support. For all I know, they would also be angry and hurt that I didn't tell them.
I'm approaching four years post-donation, and still have told almost nobody beyond the donor community. I am quite comfortable with my decision and, if I could have gotten away with it, would have told even fewer people. Although I do regret, to an extent, not being able to encourage lots of people to donate, I've found other ways to help, such as volunteering to "mentor" donor candidates. There are plenty of other things donors can do.
My conclusion has been that this is a personal decision, and not a case of one-size-fits-all. By the way, one (former?) LDO member reported not telling her mother--while she lived with her mother. Wow! :-)
Be well, Snoopy