Name Change on GC and Passport question

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When I first came to the US, my husband was going to apply for I-485 and he told me that to avoid any complications, it's better that both of us have the same surnames. Lets say my husband's name is Anand Ganesh (All names used here are fictitious). Ganesh being his father's name. I did not not want to have my fil's name as my surname at all, I would have preferred to have my husbands first name as my last name. Many south Indian women have their husband's firstname as their lastname. But because I was young, naive, timid, newly married and stupid at that time, I said ok to the name change and I got my name changed in my passport to lets say, Gita Ganesh. Now, my Green Card, Social Security card and passport are all in the same name. The expiry date in my passport is 2009 (final) . what does final mean? How do I change my name in my passport to Gita Anand. Secondly, I've been reading that you can apply for GC name change on grounds of marriage, divorce or a court order. I don't plan to get divorced and my husband may not agree to go to a court to change my lastname here. Am I stuck with this name here?