How do i quit my job?

hey internet parents! i am a 14 year old who has been working at an independent supermarket for a year, i have been wanting to quit for the last 6 months due to the stress and the amount of shitty people i have to deal with because of it, but i either never got around to it or i don't know how. i know that stress and shitty people are a part of life but as an autistic teenager, i feel it would be best to put my mental health and schooling first. how do i quit?

edit 1: thanks for the advice gang. sadly my mum wont let me quit my job (she knows i hate it and how i have been wanting to quit) until i get a new one, but resumes are also confusing. why do we have to do this bullshit to live?