That means I have to learn how to work with a team of developers instead of solo, use OOP (properly), lint, and unit test. All things I've never done before.
He looked at my code, told me I'm on the right track with my classes and structure, recommended how I can add linting to it, and suggested a few books to read.
I didn't want to waste anyone's time. I didn't know if I could even put my questions into words.
But it turns out it wasn't a big deal and I should have done it sooner!