I hope you'll forgive me for being such a pessimist, but this being the internet, I'm kinda suspicious when someone posts something like this. It could easily be someone who gets a kick messing with people on forums. It could even be a guy who recently got banned from this site and is just trrying to see how people react to his story and things like that.
So if yours is a true story, EddyG, I'm sure you'll forgive my insinuating that you're a fake.
But being a generally nice guy (it's the things that people do that make one act differently), I tend to belive you. The above is just some sort of "disclaimer".
I'd say that a way of getting things off your chest is always a good idea. Whether it's a proffesional counsellar or the old man next door, or some dudes you talk to on a guitar forum, it's good to get it off. Do it one way or another, but do it all the same.
I won't act like I know what you're feeling (there's no way for me to know that, I'm not you, I CAN'T know it). I also won't try to psycho analyse you by talking about what psychologists say about how a kid is affected by discovering either of his/her parents cheating on the other. The effects of sexual abuse are pretty well known too. All I'll do is what I've already done, tell you to find a way of getting it off your chest. I'll also dare say that you'll get back to good. I may not have gone through the exact same things you have, but I've been through my own **** as well. And so, I'm prepared to bet, has everyone else on this forum. And many of us, scarred as we are, are still holding on. And many of us are getting back to good. And making the most of our lives that we can. And loving it too.
So don't give up. You'll be fine.
Big yourself up.