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're 17. I don't know what the "17 me" would have made of CBT, but it really helped the "late 30's me". I encourage you to look it up. You don't have to let your negative thinking control you.
So the above is the internal part. Externally, I really encourage you to try and open up to your mom or dad. As a Dad my self, no matter how estranged I'd ever get from my boys I'd want to know as much as possible so I could support them. Try and steel yourself to give your parents that chance.
Prayers bro.