The only thing I ever confessed to was getting drunk. I was 16 years old and came home drunk one night. I puked and passed out on my parents bathroom floor. The next day, my mom made me call the PO of our Cong and confess. Nothing really happened as a result, but I felt really stupid for having to confess such a dumb thing.
A couple years later, my roomate and I had a party that got kinda crazy. One of the girls confessed what she did. At the time I don't even think I was attending the meetings anymore, but the elders were after me for a year. I never met with them, despite all their letters, and my mom begging me to sit down with them. The girl that confessed got df'd and later told me confessing was the biggest mistake of her life. They asked her all kinds of detailed questions about our encounter. They are perverts. I never got df'd though.