Basically, what everyone is saying is: let your kid be a kid and enjoy his time in high school.
You’ve said that your child is very social. That’s a good thing. He will figure out where he fits in.
American high schools are different. Not only do they have course requirements to receive a diploma, but they also have multiple social activities that aren’t established in non-US high schools.
Our high schools have orchestras/marching bands, sports teams, academic and non-academic clubs, themed dances, football games in stadiums with cheerleaders, and multiple drama and theater productions. Some high schools have phenomenal libraries with access to laptops for research and homework. Some schools have tutoring and homework clubs. Some students will have short schedules to accommodate their work schedules.
Some school districts have limited means, so they might not have everything that a large, wealthy, school district may have, but they all have activities.
A high school is an extremely busy place. Some kids bring lunch from home. Some kids buy lunch in the cafeteria. Some kids buy lunch at the carts (if you can call it “lunch”). Some kids with driver’s licenses’ can get permission from the school/district to drive off campus and pick up their lunches.
Your entering freshman will not be the only new kid to the high school.
He will be entering the high school with a number of students who are coming from a number of middle schools.
Let your child be a high school student.

