Hello and hope you are doing well.
Melatonin though it is naturally occurring its long term effects have not been adequately documented. Hence best avoided.You should stop becoming anxious and try to relax. Try to have a warm bath before sleeping. Have a glass of milk or read a book before trying to sleep. Don’t watch TV or do exercise before sleeping. Condition yourself that you can relax and that you can sleep well. Try yoga and meditation they have calming effects. Go for long stress free walks. Also, do exercise in the daytime this promotes good sleep.
Hope this helped and do keep us posted.
You are too young to be taking melatonin. It doesn't usually drop off until a person is older.
If you are having anxiety, you might want to take up something like yoga or get relaxation therapy with biofeedback. An OTC aid you might try would be Rescue Remedy. Back off of caffeine (slowly). Don't use energy drinks. Playing certain video games can be a problem - like the kind where you are being hunted. Start going for walks where you sprint, then walk, then sprint, then walk You want to drain off the adrenaline/cortisol so you can feel better.