100% agreed. On another message board I was on, people were always trying to blow up my spot (and really, really did about as much as they could to get rid of my anonymity) because I told the truth about myself and they thought I was full of shit. It was full of mostly average people from comfortable backgrounds, so what I saw as normal they saw as impressive and thus as me bragging and as me making up shit. So in order to protect my identity I gave them what they wanted and made a thread saying I lied about everything and basically was inferior to them. This was when I was trying to be a pro athlete, so my shit would have been out there easily and it would have ruined my life.
The only thing I couldn't say I lied about was the size of my cock, since there were pictures of it on there at one point that apparently are still floating around. I was even tipped off in PM that somebody was shown a pic of me that was unflattering from when I was younger and didn't take taking care of myself seriously. A female member who was flirting with me and wanted me was told in PM that I was underage (which was a ridiculous lie seeing as I was 23 at the time). To this day I wonder how many people who actually know me know I posted there and that it was me. I worry about it to be honest.
Remember, once you put something online it is there forever, and anybody can have access to it even after you've erased it because you don't know who saved it.