Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.

You have mentioned what they don't want you do to. What about what they DO want you to do?
Do they approve of you dating at all? Is it a racial issue or more?
I think a biracial relationship MIGHT be something you find out is a difficult one. I am not racist, but I know what I have observed. Your parents may know about such things more than you do, and want to protect you from what they have observed.
It does sound like your parents are overprotective and fail to realize you are no longer their child.
They had their chance to raise you to be an adult. You now are one, and it's time they let you be one.
I obviously don't have a clear answer as to what you need to do. You can't sacrifice YOUR happiness for the happiness of others. Considering your legal age, I say do what suits you best. They will have to accept it ... or not.
But, knowing what I know vs what they know, they arent always right. And yes I am young, I still have lots to learn.. it doesnt matter.
Our parents arent perfect either who is, really? there are blemishes there...
So, its okay to have your opinions. Keep them, you dont always need to agree. But ive also learned to pick my battles... yah know, sometimes there is unnecessary drama that can be avoided.
There is a point in time when you have to just realize, that Yes they are your parents, Yes you love them etc. But You got to do You. You cant please everyone, theres no point. So, for now Id say ignore it, I know its hard but focus on yourself, make plans to be independent if you truly wish to be away from your parents.
Make your own opinions, let their opinions just fly by.