I doubt that **very **much, unless you’re using “stealing” to include online music/movies/software/etc.
There is no way that 90% of people have secrets of the criteria the OP has stated.
Yeah, I attempted suicide as a teenager and while I don’t exactly bring this up at dinner parties I don’t see it as being “dirty” or even really a secret. It’s not a pleasant topic and not really relevant to my life today, so there’s rarely any reason to mention it. But if other people would be horrified to learn this or think less of me for a suicide attempt that happened nearly 20 years ago then I think they’d be the ones with something to be ashamed of, not me.
Hey, don’t look at me! I started a thread about mine!
I have a few deep, dark secrets, but I hold them close because they involve other people that I would feel wrong to dump on.
I can think of three right off the bat. Four if you count one that I don’t really think qualifies, but some might.
ETA: just so we’re clear, my post is referring to Clothahump ^.
By the time I was about 40 most of my dirty little secrtes lost thier status. I haven’t created a new ones.
Reading this thread, you may get the impression that I am a horrible person.
Really I’m just someone who can keep a secret.
I was going to link to that “true confessions” thread. There may be one or more of my Deep Dark Secrets in there…
I honestly don’t know.
I don’t really have any ‘dirty little secrets’
but I have been treated like one.
Well actually I do have one that only my closest friends know.
I probably do but I’m in deep deep denial and would only remember them with the help of hypnosis.
Most people’s ideas of dirty little secrets are probably most other people’s idea of moderately interesting stories.
Heh. Mine probably don’t even reach “moderately interesting.” But I was a bit of a shit to several women when I was younger.
I’m the only person I’ve ever met who’s never stolen a thing in my entire life. Even my goody two shoes sister stole a candy bar when she was 6. Well, tried to. My mom found it in the parking lot, marched her up, and made her give it back. 
I don’t really have any secrets at all. I tell people my shit so it doesn’t eat at me. I can’t imagine I’m the only one.
Nope. For example, some people don’t give a damn if people know whatever they once did or still do.
Hi, I’m john. I have a problem with alchohol. I’ve been harming myself in some way or another since I was sixteen. I way too often catch myself believing I’m intellectually superior to people around me. I sometimes manipulate people for my own gain or amusement. Sometimes I’m just a straight up dick.
I’m not proud of any of it.
See? Not that hard. Some people turn away, never to return, others greet you and say “[name], you enrich my life. See you in a month or so.”
Everybody’s got something to hide . . . except me and my monkey.
. . .and the monkey’s a liar.
I’m pretty sure that if you cut me open, nothing but secrets would fall out.
Snitches get stitches.