I agree with Fizzyo. See if you can find a trusted counsellor or doctor that can lead you to some help. Help is available. I agree the specific diagnosis isn't that important but a diagnosis from a doctor may give you some peace and help chart out a plan of action toward a better life, and an "official" diagnosis from a doctor may carry more weight with your parents.

No matter how your parents react know that there are understanding people, many who are or were in similar situation, here and I hope you find the community here helpful.