My Parents versus my Girlfriend Versus Myself, What is morally right?

They have given you a great life, however you are now an adult and are free to date whoever you like. Your family should love you REGARDLESS of who you date. Tell them to stop being so racist, and if they want to see their son happy and successful, they need to start accepting your girlfriend for WHO she is, not what she looks like. They cannot emotionally blackmail you into giving up this girl you love so much. You could write them a heartfelt letter telling them how you feel. It's them with the problem, not you.