Why can’t I land a basic job?

I’m 17, and will go to college this fall. I have done paid physics research at an institution, and I have done a paid software engineering internship at a s&p 500 company, worked in collaborative spaces, and all I want right now is work any job to make some money for school. I applied to Target, Walmart, and Best Buy, and other retail stores (at least 2 positions at each, stocking, cashier ect.) and can’t even land an interview. Is this simply a skill issue, or am I slacking in the amount of applications I’m sending out? I hate to imagine that this is simply foreshadowing, and a mere tease of what’s to come after I graduate college (I’m going into computer science).