Just be yourself and if you hang out with the wrong people than you'll have drama. Just enjoy your last few years to be a kid. Cause Once high school is over, you have become into an adult and join the real world.
Some advise I can give you is do your absolute best freshman year in all your classes to set your GPA bc your freshman year can make your GPA or break it , but when it comes to other people don't worry about them and their drama worry about you , when it come to finding your classes you will find a route and you will stick with it. And when it comes to upper class men they aren't bad at all. I wouldn't say I was scared my freshman year I was just intimidated by the upperclass men. High school is nothing like the movies. You will be fine ( be confident in your self and your abilities )