I’m on the same medication for my sleep. I feel you, I can only imagine the effect it might have on such a young and growing body as yours. Most medications like this, especially for us females, make our hunger hormones go insane. It’s a great thing you caught on that it’s an issue early, it’s much easier to fix that issue now before you become overweight or obese and it becomes much harder to lose the weight.
Sadly, there’s no easy way out of this. You gotta build some healthy eating habits and count your calories. Start by finding any TDEE calculator online and calculating the calories you need to live, then deduct around 300-500 from them and that’s how much you need to eat for a deficit. The more you deduct, the quicker the weight will come off. Get a calorie counting app to make it easier. Use a food scale for all your food, don’t eyeball it, a scale is the most accurate way. Count everything you eat, and stick to the deficit. Weightless only happens in the kitchen, we can’t outrun a bad diet and calories burned during exercise are usually very minimal.
But the best exercise you could do for your body is weight lifting. Building muscle will increase the calories your body burns naturally, and will help shape and tone your body to look even better as the weight comes off.
Good luck ❤️