Even if you don’t want to tell people, I suppose it will be known anyway at some point? Imagine not going to your job anymore, buying new stuff or travelling much more. People would think you’re either in the mafia or won the lottery
There was a TV show in France about big lottery winners, like above 50 millions. There was this woman who did hide it completely from her husband and family for many many years. She told all of them when all the kids finished graduating from university and started working a few years because she wanted them to grow up with the value of money and didn’t want them to be spoilt brats. She gave them money for specific projects and bought her husband a nice car.