NEED ADVISED

I've had a rough past few months, I stated dating this guy back in Aug. my parents just met him and don't like him at all. They told me that I had to stop seeing him last week, I saw him once after leaving my class and we talked, my parents found out and my  keeps calling me a slut and whore for seeing him again. Now they are threatening to make me withdraw From college and send me to live with my grandparents. What should I do, can my parents really make me leave school?