Man in a mess, you picked a good name for yourself. First off, let's start with some basics. Read the things on this site with great care.
Secondly, understand that you ARE in a mess and that there is no painless path back out of it.
If you look at what you said, you said that you feel that you're unable to open up to your wife. That's not your wife's problem, it's yours, and you need to address it.
Going out into the "singles" scene isn't going to address it. It's going to put off addressing it and in all likelihood will make your life much worse in the long run.
So.... now's the time to sit down with your wife and, calmly, courteously, and respectfully explain what you've done. Do I think you should figure out how to be a successful husband? Yes I do.
Your wife will have to decide whether she's willing to work on being a successful wife with someone who's been dishonest for years and who has now had an affair. Do I think she should? Yes I do.
I had a good friend who said things much like you're saying -- that he couldn't be honest and open with his wife. What did that lead to? It led to an emotional affair (with me), the end of his marriage, physical affairs (with me and various others), and a new marriage with exactly the same problems as the old one. And now two lovely children and a wife who is innocent of any wrong except that she doesn't know how to create an environment that's safe for him to express himself in, and he's refused to tell her.
I'm not in contact with him anymore, but I have to say that I see little hope for his marriage unless he changes his actions and behaviors. I hope that you're better able to do it than he is. I really, really do.