There was a time when I'd have been completely mortified if anyone found out about the kind of things that I'm into with regards to TUGs. But that time's been and gone.
There's been a few instances of when my friends have looked at my laptop when I've accidentally left it unlocked (I knew because they posted some hilarious Facebook statuses from my account at my expense) and though they didn't say anything about anything bondage related, I'm sure that they'd have very easily found out some very eye opening things on my browser history. It doesn't bother me at all though.
I've accepted that it's always been a part of me, and always will be. If someone finds out, who cares? The absolute worst they can do is think you're a little bit weird. You can guarantee the person judging you has a fetish of their own that they don't want you to know.
Sure I'm not gonna deliberately shoehorn it into every conversation I have or loudly broadcast my love of bondage to the whole world, but if someone does find out, I'm not bothered at all.
I've nearly been caught doing self-bondage on a few occasions too, but I'm always prepared for that so if I hear the slightest peak then I'll free myself before being incriminated. It's one thing people knowing you like bondage, it's another them walking in on you tying up and gagging yourself. To be honest though, I do kind of have a fantasy where someone does walk in on me doing just that and decides they may as well finish the job and tie me up properly.
