Aww. Just hang in there. You will be finishing your high school, and go to college soon. you are not alone. It did happen to several of my friends who have been through like yours. They are worried about you and your future. that is understandable. 
But you can point out to them that some Deaf people works as lawyers, federal employees at many different depts, and varied of jobs with computer and they all are ASL users, just like me. Just educating your parents a little by little.
