Hugs, AP. I know what it feels like to be the topic of other people's gossip.
Realistically, though, it's really optimistic to expect acquaintances to keep your secret. Sure, some of them may have a sense of propriety, and avoid gossip, but it's the human condition to want to use knowledge as currency (I'll tell you my juicy tidbit if you tell me yours), and there are other people that simply can't keep a secret no matter how hard they try.
When I transitioned, I resigned myself to an existence where I had to assume that the people around me would eventually find out who I was. I know this feels disappointing, because the stealth life is seductive, but in reality that sort of secrecy takes an awful lot of luck to maintain.