Any college will understand your changing your career goals and shifting the focus of your remaining high school electives based upon your desire to major in French Education. The advice of a savvy high school guidance counselor, in addition to information you can obtain from college admissions offices and collegiate French Education departments, will assist you in selecting the best courses for the remainder of your high school education. If necessary, you may always take high school or collegiate summer courses in addition to those courses offered at your high school during the regular school year. Colleges will not penalize you because you have not had a certain number of advanced courses related to your projected college major. They will, however, be impressed with the enthusiasm and dedication you now show related to your interest in French Education.
Your biggest problem is not your eventual acceptance to a college to pursue French Education studies, but your relationship with your parents. You need to make peace with your parents, and they need to accept and respect your change of academic focus and present career orientation.
I would seriously recommend some family therapy...for everyone's sake. There are too many hurt feelings and disappointments within your family to leave unattended. Your relationship with your parents is not going to get better on its own. If you still try to please them somehow, while eagerly pursuing a life path of which they don't approve, you will inflict more emotional harm on yourself. If they will not see a therapist with you, see one on your own. You need all the encouragement and support that you can find. Please seek that support from as many family members, friends, and teachers as you can.
Your parents appear to have established unrealistic expectations for you regarding your future career choice and until recently you felt obligated and trapped by those expectations. It will take some time to reestablish a relationship with them that is based upon mutual respect and trust. I hope that you are all willing to put in the work to accomplish this goal.