i feel like im doing highschool wrong

im not in any big friend groups anf i feel like im just a part of the background. im not in any sports but i am in band and i dont go to parties unless its with my friends who are also in band. idk how to talk to people in a way to come off as likeable, i get so nervous and just choke and havent made many friends that are new in highschool. most of my friends are people i knew previous (middle school and elementary school) am i doing this all wrong and how do i make friends here?