Hi, MSN. I can really feel your pain, they scream out from the page. I know G-d hears yours prayers, don't give up.
I can sympathize with the guilt and shame. I know exactly how it feels to be known for one thing by others and to know myself for something else entirely. It's a terrible feeling I don't wish on anyone and I'm struggling with it now. Here are some things that seem to be working for me.
Be positive. Help yourself. If nobody else, let "you" be there for "you". Truth is, you're just one man, not two or three or however many. Just one. And we all make mistakes; that is part of being human. Yes, you might think your errors are the worst, but everything looks like the worst when you truly regret it. We need to move past zeroing in on our errors, terrible as they may have been, and start looking towards our well-being, our healing. How do I know we deserve to heal? If G-d extended teshuvah to our lowly state, he extended healing as well. Let's heal.
It's time and move forward with a right mind. I had to face myself. It wasn't fun or easy, but I did (and I still do). You can do the same. You might find, as I did, that there is a way to live with who we are, even with this knowledge of who we've been. Tell me, who else are we if not ourselves? The only way forward is to accept ourselves and seek honest ways to better ourselves. I am comforted by the fact G-d is the One who called us forth to live. It is reasonable to believe we are in good hands.
Accepting yourself doesn't mean accepting only that side of you that has erred, but also that side of you that is wise, loving, family oriented, fatherly, kind. The list goes on.
Strangely, when we face what we fear, it isn't scary anymore. It loses its hold. Facing ourselves, even the ugly side, has a way of giving us strength, making things manageable that once seemed all too unmanageable. This has been my experience. Somehow, we come out able to live with ourselves.
Mr. Hyde becomes subsumed in Dr. Jekyll, but only when we face and accept him. Until we do, it is a terrible duality that we see, with us stuck in the middle crying for the shame of it all. But it all changes when we face the darkness, honestly and with a desire to return to G-d. We start to live again. And, as living tends to Dr. Jekyll, Mr. Hyde is sublimated. Again, this has been my experience. I am still working out the kinks and taking it day by day, but these are some of the signposts I have seen on my way out of guilt and shame.
Maybe I misread your guilt. Maybe I'm just talking to myself here (I know I certainly am at least talking to myself). If this message isn't for you, no problem. Pass it along to the next guy. In any case, I am and scores of others on this site are pulling for you. Hatzlocha Rabbah!!!!! Keep your head up.
Do we really belive that G-d is on our side? We should. This is the key out of gehinnom.