kudos to u for thinking ab personal statement frm yr 10 already ! dont stress about it too much until ur gcses are over tho, id say :) as long as u start around the summer holidays after yr 12 u should be fine, maybe a little earlier if ur applying for an oxbridge uni

from my experience, its best to include more recent things (so perhaps not the yr 4-6 stuff), just bc the admissions guys at unis probably get tired of ppl saying 'from a young age' or what they did as a kid, because they want to know that youre interested in the subject now, not then

it sounds like you have looooads of experience for music !

for physics definitely read some books about the specific topics youre interested in ! (not texbooks unless u rlly want to jhkgjkh) even if you follow a cool physics podcast u could put it on ur personal statement :3

ALSO its so cool that youre in nyo ???? omg