I graduated last July (unrelated field) and was pretty sure I knew nothing. At the end of my classes, I was assigned my final work op in the job position I'd gotten my degree for, I needed 300 unpaid hours to meet grad reqs. I broke down and bawled because I felt so unprepared, and it was in a city an hour and a half away so I'd be staying up there and felt alone and terrified. My mentor in the job was the best guy I'd met throughout my entire education. He drove me around town showing me where everything I needed was, and I told him I felt unprepared. He assured me he still didn't really know what the hell he was doing, and that it was okay to feel that way. I had convinced myself at that point that I just needed to finish the job and get my degree, and I'd never have to make a career out of it.

I ended up crying when I had to leave that place. I knew more than I gave myself credit for, I had a great couple months there, and made some excellent friends. They have a job opening, I interview on Wednesday (which I'm freaking out about) and I'm still not fully confident in myself but self doubt only makes that harder. You'll never know everything, and you'll make mistakes, but you can give it your best shot and be proud of yourself.