I used to have a bunch of secrets. I was a virgin until I was about 27 and I kept that a secret for years. Ironically, that really isolated me and made it *harder* to lose my virginity. I'm a nudist/exhibitionist, and I kept that a secret until a couple of years ago. Now, I try not to have so many secrets. Still, I've got a couple that I don't tell even my wife.
I don't know that I have any secrets. There are some things I don't share with some people. Either because they wouldn't care, wouldn't approve, or it would just confuse them. But I'm not sitting on any information that I feel like I can't share with anyone.