You might feel compelled to entice me with fantasy stories about how I can learn to be happy. H2 enticed me with those same stories. Look how that turned out. I am not gong to be fooled twice.
You might not learn to be happy, but you can certainly be less unhappy if you take relatively minor steps to do so.
For example - I promise you there is somebody out there who is a better match for you. More often than not, this person appears without one looking for them. Will they make you ecstatic? Maybe not. Less unhappy? Absolutely.
There is another woman your age out there, who likes pc gaming, Star Trek, and hates working out, and anything else that you happen to be. I promise you. She also likes sex.
Now, your state of mind, as you suggest, may have little or nothing to do with your wife, but you are here, aren't you? If you had truly given up and accepted your lot in life, you wouldn't be here venting. You wouldn't have spent 13+ years on message boards looking for answers. So you're not as accepting as you think you are.
Let me tell you a little secret - divorce and alimony is not the end of the world. Everybody dies at some point, and you can't take it with you, so why not live the best life you can live? You don't have to reach your full potential, or cure cancer, or invent a better doo-dad or anything like that. You just have to be happy. And in order to take the first steps towards being happy, you need to remove the negative from your life. Getting rid of the bad wife baggage may only be the first step, but that's just it, it's a first step.