Someone help me

I am 21F i just graduated from uni with cgpa more than 9.I recently got my new job, and i noticed few things about me Firstly, i noticed that i feel so overwhelmed at work. I feel like i am on edge throughout the day, i pay so much attention to work to not mess up but i still end up missing small details, i make mistakes in the most easiest tasks. My supervisors don't really trust me anymore. I was a god gifted student for my whole life,it's true that i have some confidence issue but it never effected like this before, even though i hate public speaking i was a person who never backed out. why am i messing up right now??? Can anyone help me with some tips to help with it