Some people on this forum dislike AFC Adam, but I'll throw it out there anyways.

He runs something called Social circle game, or Entourage game. Big part of that is be the guy that makes things happen. Organize events, parties, etc. Your social proof from that is astounding.

I do it to a lesser degree, but it works so well. If you are the guy that gets into bars free cause you know everyone. You get spoken to all the time by people etc, people will start wondering who you are. It's insane how well it works, especially in a school situation.

Also Maxemillions advice on confidence is gold.

Where are you based? There is bound to be someone who lives around you who can show you some ropes. I don't know what age Sixth form is, so hopefully I'm not giving PU Advice to a minor here