My life experience shows that not everything that happens in your life should be told to someone. There are things of a personal nature, and if you don’t want to talk about them, then that’s your own business. But there are some cases when you cannot remain silent about your passion for gambling, if, for example, a person gets married, then his spouse should know about such things, over time he will find out anyway, because God makes everything secret obvious, and this is a serious issue that can affect the entire family's well-being
Of course not every stranger should not that you gamble. You dont even have to tell it yourself to others. But my idea is not to keep it in secret on purpose. There is no need to do it when nobody is at home only. If asked what your are doing or if you gamble - answer honestly. There is no need to have a special secret bank account to gamble with that money only (but it might help to those who cant control their finances). There is no need to clean browsing history straight after gambling and etc. If asked by family of friends - answer honestly. They wont judge, and they dont have right to judge you.