Just don't tell them? BTC isn't something physical so if you are not stupid enough to write it on your forehead that you have bitcoins, nobody will notice anything. You could carry a million bitcoins in a usb disk. Nobody will know it. Your wallet is literally a text file which carries your public keys or seed words. If you don't even want to carry a usb stick, then memorize your words and it will be even better. With bitcoin&crypto, unless you make stupid moves, you can't fail. In fact, you need to try very hard.