Incoming freshmen

Any advice for freshmen? I already started the first day.. without the upperclassmen and sophomores. Tomorrow is when the rest come in. I'm not sure how I feel about highschool. I'm mainly worried about getting in the older kids way. And/or not being smart enough in my honors classes, etc. If anyone could give some good and accurate advice about high school (honesty please, no matter how hard it is to hear the truth about high school, it's better to know.) I'd really appreciate the advice, thank you!