N., can you do your GED on-line? If you can, do that. You will need your GED whether you are married or not.
He is holding you hostage, quite frankly. We can't determine why, but it's really important that you work around this.
Talk to your family members. See if they will let you come. Form a plan. Either do your GED online, or go to NYC. If your husband says you two are done if you go, call his bluff. You can work in NYC while you go to school. If he actually loves you, he will "get over it" and accept that your marriage will have to include your wants and desires as well as his own.
Please do this, N.. Life will NOT get any better if you stay and languish. Life is not a holding pattern with not being able to move because a spouse prevents you from having any life outside of the home. Please don't have children right now with him either. He will use that to further subjugate you.