At the risk of sounding ghey, listen to your heart. It knows what's right.
You sound like you really, truly want to leave. For what it's worth, I would never talk about my wife the way you do. Sure, we fight, but not like the way you describe. And the way you describe her, and the way you describe your feelings for her...well, that's just not the way a man talks about a woman he loves. It's the way he talks about abusive parents, if I may say so.
Clearly, you've fallen out of love with her. It's time to stop "chasing good money after bad". Cut your losses, be a man, admit you fucked up by marrying her, take accountability for the fact that even though this ride if fucked that you still played a part, take stock of yourself and your emotions, then get out. Fast. Like now. Stop wasting time. The lawyers can take care of everything for you. You're unhappy, and it needs to stop before it ruins your health, which all any of us have.
If you even love her just a bit, you know it's not fair to her to stay with her and ruin her life. She certainly doesn't want to spend the rest of her life with a man who feels so angry about her. She wants someone to love her too. Just like you do. You both deserve that in life. Because life is short...too short to go through it without love. She obviously hates living with you...she's so angry all the time. I wouldn't be surprised (and neither should you) if she expresses relief once the shock of a pending divorce sinks in. She'll see that this is good for her too. She'll feel like a failure when the marriage fails, and beg you to stay. But those are superficial emotions...the basal, truer ones are screaming at her to get out too. She'll see that in time.
And for christ's sake, don't have a kid. You think shit is bad now? Trust me...as bad as it is now, watch it go off-the-charts-shitstorm-in-a-teacup-bad when you have a kid. Kid's wreck the strongest of marriages. Almost wrecked mine. You need a rock solid union to withstand the shitstorm that is children. I wouldn't change anything now with my kids...love them and would willingly die for them, and I truly love my wife. But fuck me...when the kids were babies, it's like we were always one step away from saying "fuck you I'm outta here". Just this seething hate brewing below everything we said. Mostly, it had to do with sleep deprivation and a complete loss of control over our lifestyle, free time, and individualism. And the realization that forever and ever, our hearts would be tethered to these little people who had the ability, just by getting sick or dying, to completely and irrevocably change the course of our entire lives. That's some serious shit man, and if you want some of that, you need a woman you can count on through the ugly times. Because there will be a lot of them.
In short, get out now. Stop being unhappy. Stop making her unhappy. You are not compatible, and are simply not good for each other. No big deal...lots of people shouldn't be married. Pride yourself on the fact that you recognize it, and are getting out now.