Dear younger self,
I, your 16-year-old self, am going to give you some advice. First of all, get over "Classic." It was a good song for a while, but it isn't anymore. I know you spent a while memorizing the words, but that will only come in handy when you're in the car with your future kids.
Second, give up on your friends. I know that doesn't sound like a good thing to do at the time, but it will benefit you tremendously. Mom will see one of them smoking pot and she will eventually become a teen mom. The rest of them use cuss words in every other sentence. I know you think they are so cool for doing that, but trust me, they aren't.
In a while, your grades will start going down and you will feel like you are disappointing mom and dad. When school ends, you won't have any friends because you were smart and let go of everyone you knew. You will cry at 8th-grade graduation. Not because you will miss it, but because your English teacher won't be your teacher anymore. Don't be disappointed when mom doesn't come. She isn't allowed to leave work.
Appreciate life without anxiety and OCD. It will become a major problem in your life. The summer will pass and freshman year will hit you like a brick wall to the face. It will be awful. You will hate it. Your classmates will love it. You won't have a lot of homework, though.
Sophomore year will have the same effect as freshman year. You will hate it even more. Mom will suggest going to the rival school. You will shoot down the offer a lot. Eventually, you will agree to go and visit. You will love it. You will transfer there and love it. You will start listening to Twenty One Pilots and Panic! At The Disco. Finally some good music. You will find your group of friends and life will be so much better. Enjoy the ability to be childish while you still have it.