Re: do i have to eat if i'm taking vitamins?
Yes, Yes, & Yes. The body needs calories. Calories from proteins, complex carbohydrates, etc. to function. When you do not eat, you lose fat, and muscle. It will affect every bodily function. It will affect your heart, brain, etc. Lack of food can lead to permanent damage and even death.
Vitamins are meant to support an unbalanced diet, not a substitute for food.
You should have a physical by your physician if you are feeling physically unwell. Or talk to a therapist. Your parents get angry or upset because they are afraid for you, and want you to be healthy and happy.
The longer you wait to get help, the worse you will feel. Please see your doctor.