The older I get, the more I empathise with teenagers. It's far and away the most difficult era of your life.
You'll have incredible pressure to not ruin the entire rest of your life, you'll be constantly told to make decisions that will have a massive impact on your future (with little help or course correcting, I hope your three years of interest in that one subject lasts a lifetime).
your body starts mutating like a slow version of an American Werewolf in London, you're thrown into a school that often resembles something out of Lord of the Flies, and adults aren't there to support you, they just want you to be that 8 year old innocent child or a full blown adult with no inbetweens.