Is it natural to feel sick and emotional after first day at new job

Iv recently left school. Im only 16. I get days where I feel like crap and other days im on top of the world (rare) tbh. Iv recently started a new job which is my first and iv been at it for my first day and i came home and just felt like crying. I dont want to tell my parents how I feel and really none of my friends (im usually the one who gives advice). i would say i do have bad anxiety but i feel as if i could get somewhere but then i just over think then my head starts making me feel bad thoughts.
Anyone felt like this and anything that is reassuring?
I dont want to quit this job as its too soon to do it ?

Aw just sit down and take a deep breath! It's only been your first day. I worked in retail for three years and on my first day I came home and balled my eyes out because I was not confident, didn't know anyone, didn't know my way around. I promise you it gets better!! Within the week you will feel different.

Working is a very different environment to school and it is a massive adjustment so it't natural to feel overwhelmed. But try to think of the massive achievement you made today! First day of your first job! You should feel very proud of yourself! Just have some comfort food, watch a funny movie and have a good rest and you'll feel better