I don't really care if someone were to find out about it, a couple friends have via ye olde "porn still up when computer turns on" route and it's been whatever. (except for one prickish moment where one of my friends asked a car full of people, "what if the biggest badass you knew pretended to be a baby all the time? Like you're a party with this dude who's wearing baby clothes and a diaper but he ends up getting in a fight and kicking ass, what would you think?" Everyone was like "Wtf D? I don't know man, I guess it'd be weird." I think he was just trying to be funny but he shut up about it once he caught my deathstare from the backseat and didn't bring it up around me after that.)
But it's not something I would willing tell anyone who isn't a romantic partner. I'm not really embarrassed about it but I don't see the point in sharing my kinks with my friends. I don't want to know their kinks, I assume the feeling is mutual. If someone I know asks and isn't one themselves I wouldn't deny it, I just tell them it's none of their fucking business and I would be kinda pissed that at them for asking.