Do good throughout high school! Ima tell you some real shit right now!
-me- I did good my years in high school! I got a 3.75 which is a B average! I can go to any college I want (minus Ivy League) all the doors I want are open for me! I applied for the college of my dreams, got accepted, and I got a full ride! I got extra money I can use to pay for dumb shit I don't need!

-my friend- didn't do shit in high school! Fucked around, and now it's time to apply for college and she got into the place of her dreams! HOWEVER! She can't go because her grades were so shitty she can't get a scholarship/grants to cover it! She's got 4,000$ she needs to come up with... Which she can't so she can't go to that school! She hates herself for not applying herself in high school! DONT BE HER! Get your grades up! Apply yourself! Do what you gotta do! You will be rewarded I promise!

Rules of high school
-have fun every now and then
-be yourself (people will gravitate to you)
-don't take no shit from nobody
-keep your grades up and apply yourself

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Don't overwhelm yourself. Breathe. Take a break. Your mental health is important. Your GPA matters, but it isn't your name. Don't make friends with every single person. Make friends with the people that accept you for who you are. If you feel like you have to act fake in order to please someone to be your friend, then they aren't a real friend. It won't necessarily be "the best four years of your life" but it will probably be the biggest learning experience of your life. Always do your homework and study, but also always take care of yourself. You matter. If you need a break, be able to recognize it and take one, but don't allow your need for breaks to turn into laziness like it did for me my freshman year. You've got this. This will be a huge transition, but you can do it.