brother, this is a serious situation you are in.
i just read a saying "bring it on life, i will chew it and spit it out"
well, i think if i were in ur shoes i would ask what i want. but there is more to it. its not just about u now, its also about her and yall's family.  escaping is not the best way man.  you should be able to work it out.  reading ur posts its clear that u want to leave her.  its clear that u are wearing this invisible pair of glasses from which when u see, u can only see one solution - leaving her. so, back up little bit and see a bigger picture.  u said she dont love you but is married for a reason - US citizenship, is that right? it also sounds like she broke up with her bf back home to get married with u (may be because her option is the guy with US citizenship).
listen man, life is not fair. as one grows older everything seems like selfish.  your case is complicated because of the marriage.  if u were just bf gf then u should just end the relation but now, u cant and should not end it.
lets say if u divorce her, then what u gonna go back home find a virgin one.  time has changed.  girls will have sex if they are around 25.  if u wanna find someone around 18/20 there is be issue of age gap.
dont break up man, try to work it out and it will
remember that what you become tomorrow is what u want to become
u can have a good family with her man. u need to communicate.
brother, whatever u decide i hope its for the better u and her.
i am sure u can handle what life throws at you!
Good luck mate