If he's not saying it after 2 years, he's not feeling it. Most couples are deciding to marry after this amount of time. Especially at your ages.
Mixed race relationship are hard enough when things are good. This guy isn't fulfilling your needs and you're estranged from your family. I think you are grasping at this guy b/c you are afraid to be totally alone.
Don't be. Make amends with your family. You're long distance anyway with no real hope of a future, so just start distancing yourself and preparing for the break. Its coming, no question.
Sorry we aren't telling you what you want to hear. But we are telling you what you need to hear: this relationship isn't likely going to last. Terribly sorry, but its the truth. Seen this before, many times.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh