How can I get out of a forced marriage?

I'm 16. My father recently returned from the middle east (he is a strict Muslim) and told me that I was ready for marriage. I live in the U.S. and I absolutely do not want to do this, I've tried convincing him to wait until I finish school, anything plausible, but he has rejected it. I have heard of the Forced Marriage Unit, but my father has threatened to hurt my mother (they are divorced) if I do not comply to marrying some boy in the middle east, so i cannot run away. What can I do to help protect my mother and also myself? My father is planning on making me go to the middle east this summer under the guise of meeting family, but I know the real reason is marriage.