I would say that if you have just now signed up for the online community, it is far too soon to give up. Check out profiles for Silly Old Bear and Young at Heart for men who have been able to turn their situations around. You are only learning what you need to learn.
It is painful. There's no question about that. But don't give up yet. Do the work first, for you, for her and then, after a year or so if there has been ZERO change (read The Divorce Remedy too!), then you can walk away with some semblance of peace.