You don't have to feel guilty about who you are. No one chooses which body they get. But I think what people of color would like is for you to realise that because you are white you have an automatic advantage in some cases. That the world is not a level playing field, and some are forced to work harder just because of their race/ethnicity/gender/disability. That's all. Not that you should mourn your colouring and correct all the suffering in the world.