How hard will it be to adjust to the USAF if I have only lived abroad?

I am interested in joining the Air Force, but I have never lived in the US. I have dual citizenship, but always lived abroad. I am currently writing from Japan. Is there anything I should look out for? Is it a good idea to join despite not really living there? My reason for wanting to join is to be able to pay for college and get direction in my life. Have you heard of anyone else in my situation? Any insight would help. Thanks.