My question involves landlord-tenant law in the State of: California

I participated in a Korean Exchange student program to attend UC Davis and signed a 1 year lease agreement at the apartment which I live. Due to financial problems back in Korea I am unable to continue living her and must move home asap. When I spoke with the apartment manager she imformed there was no negotiating and I am liable for the next 6 months of rent. She said that if I were to just leave that I would be in a lot of trouble and banned from enetering the US ever again. What options do I have as I do not have the money to continue living here and is what they said true? Also would this have any affect on my korean credit rating because they have a copy of my passport with my korean social security number