How can you find out the races im mixed with?

It depends what you're mixed with. Look at your parents. The most common ones are, black and white (like me). You'll have light brown skin, all the way to even white cause you mom/dad's side could make you look white or the other way around. But anyways you'll have like curly hair when you wet it and like more customized features. Like my little brother has dirty blonde curly hair but his skin is white like a normal white person, but my skin is light brown and i have natural curls but i straighten it. (: