How did you come by a diagnosis of Depression, Anxiety, and/or ADHD without your parents approving? If this is a self-diagnosis or a non-professional "diagnosing" you, I would be skeptical. The main thing is if you need help, get it. Don't live life in pain because you are afraid of what somebody might think. Get help now. I am not a mental health expert, it sounds like you have a significant level of paranoia which is not really addressed in any of the three diagnoses you listed. Do yourself and those you love a favor; get help now.