Need help managing teen adhd

I told my parents about ADHD. Coming from a narrow-minded family in a small Indian town, their first reaction was, "Are you crazy?" Then they started saying, "If you keep saying you have it, you'll end up having it. Stop talking about it."

After arguing for quite some time, they finally took me to a local doctor who only had a diploma in mental health. He probably hadn't heard about ADHD in years. He simply said, "Your grades are okay, so you're just overthinking."

It's been months now, and they still won't even let me talk about it. The whole situation is causing me so much stress that I feel like my cortisol is constantly through the roof. I honestly feel like I'm being treated as if I'm crazy.

I even ordered L-theanine, but they forcefully took it away, saying it was a dangerous drug. This whole situation is really affecting me mentally. I honestly don't know what to do