I just got hired and wnat to quit, what should i do?

ok so i just got hired at aeropostale and my first day was yesterday. i really hate the job. I got the job because i am shy and i want to grow and be more outgoing but i just cant deal with this job. I thought i would be able to deal with it but i cant. I was slacking in school today because i was just thinking tht i have to go to work today from 5-closing and on friday from 1-8 which is a long time. idk what i shud do. i want to quit but i just started and i dont want to seem irresponsible, but i just dont like the job its starting to get me stressed out. help please