16 is a pretty crazy age to be. Not only is your brain still growing and adapting to everything around you, trying to keep up with the world today, but you're also on medication that affects you.
No ones likes it, but pain is a part of everyday life. Some people get a lot of it, some people barely get any. It's the confusing system we are trapped in as people. Obviously if you make that final decision, there's nothing anyone can do to stop you. But all I have to say is please give it some extra time. This isn't saying "Things will be better" this is saying "Things will be different." Life just changes, all the time, even if you stopped noticing it. I sincerely hope in your case that it changes for the better. 16 years on Earth isn't enough time to experience what the world is capable of, or what you're capable of.