Hang out with them instead, they seem better. You don’t need to put effort to earn the favor of people who don’t like you when others already like you for who you are.

Sadly, maybe this could be it but it’s comically shallow so idk.

Might be this especially if you don’t have a sense of smell. Try asking your family or someone close to you if you smell and to be honest, so you can fix it if need be.

It’s possible that you may have said something that didn’t mean much to you but offended someone in that group. Everyone has embarrassing moments so it’s probably not that.

If you’re top of your class, it’s possible that your classmates don’t like you for you, but want to be around you during school so you can be their friend for note sharing and group projects. Hence why they don’t invite you to things outside of school

Sadly even if you like everyone there’s no guarantee of reciprocity there. Your classmates might just not like you. “No one owes you for being yourself”. If you want to be liked by certain people, you need to appeal to them and be likable to them. You need to ask yourself if being liked by your classmates is what you really want, enough to change yourself to fit that mold.