Back when I was having marriage issues, before it all went to hell, I was amazed at how many online friends I had via social media, and how useless it all was for the needs of actual friendship in tough times. I think a random, semi-anonymous board like Gaf is great for stuff like that.
It's unfortunate about your having family who know your name here. My brother has since gotten an account, and I know he reads my posts, but I don't think he's gone through my many years of back-posts. The prospect is a bit disturbing, I'll grant you.
I'm not terribly familiar with Reddit, isn't it anonymous? Maybe that's your best bet. Either way, best of luck to you, sir.