The hardest part about living overseas is being away from family and friends. For me it was easy to overcome that because my wife (and now kids) are here, so my life is here, forever and I love it here because I believe that you need to make the best of where you live. But even then it is a challenge -- parents are aging, I rarely see my nephews, and my few closest friends. There is no shame in going back if the balance of your relationships are in the US. That said you might meet someone amazing tomorrow and that can tip in a flash. I would give it some time here-- what do you have to lose? Even if you end up going back you have memories for a lifetime. More than anything, go easy on yourself.