How do I get out of this marriage?

Almost ten years ago I met a Russian girl online and after a few months I brought her to the US and we got engaged. After three months of arguing non-stop I told her it wasn't working out and that she should go back to Russia. She refused and really played on my feelings to get me to let her stay. We decided it would be harder for her to leave and then come back again (if we decided to reconcile) then to just go ahead and get married. So we ended up getting married. Its been ten years of living hell. My health, my finances, all of my friendships have been completely destroyed by this relationship. This girl is the most self centered, selfish, conniving, sneaky back stabbing two faced heartless person I have ever met in my life. Absolutely cold as ice. We have not had in almost four years now. Yet she still refuses to leave. She has another Russian bride friend that sleeps around on her husband and cheats and lies and steals from him. I really hate this girl I'm married to, but she is completely dependent on me. I want to get away from her so bad. What do I do? If I walk out she will have nothing, I guess she could go stay with her freakish girlfriend, but other than that she has no other resources. Every time I try to have a heart to heart conversation with her she sees this as a sign of weakness in me. I've tried for ten years to work this out with her, just talk, get counseling, anything, but she won't do anything. I don't even understand her anymore. Any ideas? I don't want to leave her on the street with nothing, she completely depends on me. What should I do. By the way, everyone I know says I should just walk away. What should I do?