I've never told anyone, and I have trouble picturing myself telling others without a very good reason to think they'd be okay with it. I did get 'caught' when I was in my early teens though, when my sister found out I'd read a few bestiality stories. She briefly mentioned something about it during an argument, but nothing else. Considering it's been close to 20 years at this point I'm not even sure if she'd remember.
I do know my parents are likely somewhat ambivalent about it, as the Netherlands adopted a law explicitly outlawing sex with animals, or being involved in any way with pornography of that type. (This includes simply owning/viewing bestiality porn). It was a whole thing in the news back then, and I remarked that it seemed odd to make a new law for it: in the past, it was prosecuted under animal cruelty. Surely that would suffice? They pretty much agreed, stating something along the lines of "Considering cows and horses take whole arms inside of them during some vet visits, I hardly think they're even going to notice some guys junk", but that anything hurting the animal should be illegal. This seems to be shared with their default view on sex, as they do know I am/have been active in the kink community, to which they just replied "well, if everyone's consenting and no-one gets unduly hurt, have fun".
As for all the people mentioning finding others on FetLife, I'm fairly surprised at that to be honest. I am (or rather was, pre-corona) somewhat active in the scene, and it was pretty (implicitly) verboten. The rationale being that the main creed of the scene was either SSC (Safe, Sane, Consensual) or RASC (Risk-aware, Sane, Consensual), with the argument that animals (much like children) are unable to properly consent. This is of course ignoring the fact that adult animals have an instinctive drive towards these acts and more, but I'm simply illustrating what the rationale from the scene was/is like.