How do people here with no previous experience find jobs?

Hi guys I am 20F with no prior experience and I’ve been getting rejected left and right. I’m mainly applying for retail and fast food positions. I called up a few temp. employment agencies and most of them say they’re looking for people with previous experience. Feeling pretty hopeless right now. I’m not in any position to do any courses since I already have full-time university. I arranged a volunteer position at an op-shop but im not sure if it will help. Any advice on how to get out of this situation?

Edit: I’ve thought of doing traffic control is this viable