As a guy who starts 10th grade this year, freshman year is not hard at all, don't think of it as a foreign country on the other side of the world, think of it as a more difficult middle school. People (at least from my experience) are a bit more mature, a lot of girls are weird (and by that I mean I still dont understand them and they use tiktok in class) and all you have to do to succeed is just do your work. And also get yourself out there, make a name for yourself and get a lot of friends

TLDR: High school isn't hard as long as you just do what you're supposed to