I think you misunderstand "persona."
Certainly, everyone wears a mask much of the time. In the real world, however, that mask is tempered by the fact that you'll end up fired, divorced or punched in the face if you aren't careful.
On an internet forum, there are no such restraints. If an internet forum brings out the 'real you,' it almost inevitably brings out the worst version of the real you. The worst consequence you face is being banned - and that's an anonymous you who's being banned anyway; on most sites, you can create a new name and be back the next day, often several times before the administrators catch on.
By "persona," I don't necessarily mean anything positive or negative. It's simply that every forum has a culture, and participants adapt to that culture. You are inevitably acting out a part an internet forum. It's a form of theater. You may wear a mask in real life, but on an internet forum you are a mask.
Your perspective on real life sounds much darker than mine, so this may account for our different perspectives on internet forums. I've studied and written pretty extensively on this, and I've never seen or heard anything suggesting that an internet forum brings out the "true self" in any positive way.
Just my $0.02, but I think I'd be focusing on the apparently highly unsatisfactory relationships with my employer, wife and children and giving internet forums a rest. I have a personal 300-post limit on any forum, which I just realized I've exceeded here.