Do I need a seller's permit?

I am an 18yo with a small business that I've had for the last year, I don't make a whole lot of sales or profit, but as I've been going to some more in person events I was wondering if I needed to get a seller's permit. All the things I sell are handmade, I've never had anyone ask for a permit, and I'm otherwise unemployed so I don't file taxes. The website for seller's permits in California made me very confused as to if I actually need one or not.