17F experiencing daily palpitations

Hi, I’m a 17-year-old female, and I think ive been experiencing heart palpitations lately. I feel sometimes a beating in my throat,m. I notice it happens more while im resting, and im trying not to scare myself. Over the past three years, I’ve had multiple tests done: ECG, EKG, chest X-ray, and have been checked by three different cardiologists, all of whom said my heart is fine. Despite that, I still get palpitations, and it’s making me anxious.

I often drink black tea frequently, but I’m not sure if it’s the caffeine, my diet, or something else. I drink water, but not as much as I should be drinking everyday (8 glasses). Has anyone else experienced this? Should I be concerned, or is this just something normal? Any advice on how to manage it?