Okay, take a deep breath. Do not throw everything out. You’re experiencing what I’d like to call “fashionitis”, a non-fatal condition in which you compare what you have to what everyone has and feel inadequate. The cure for fashionitis? Realizing that your style isn’t “iffy”—it’s evolving, and something that’ll take time to figure out. People develop fashion instincts over time, realizing what works for them and what doesn’t, what they love and what they don’t. I’m sure some of the people at your school were born with an innate sense of style, sure. They might be those types who always know exactly what they want to wear and it’s always effortless. More likely? They spend a significant amount of time planning their outfits daily so that they look effortless and like “Oh, this old thing?” There’s so much pressure on people to have a rock solid idea of their personal style at your age, but trust me—I’m speaking from personal experience—it’s an evolution. And there is a joy, whether in style or anything else, to taking time to explore and play and learn.
I always say that people should dress for the job they want. In your case, that means the best thing to do is dress the part of a photographer. Show you take the job seriously by wearing the right shoes: no crazy heels and, on the flip side, no dreadfully practical shoes like Crocs or Uggs please. You are, after all, working in a world of style. I’d recommend a boot with a low heel (which most podiatrists say is actually the best type of heel to wear, period) such as the Rag & Bone Newbury or the Acne Pistol. They look great with skinny jeans and dresses alike and, from what I hear, are comfortable to boot (yes, that was a terrible pun). Have a lovely summer internship—and remember, an internship is a launchpad to a career. Take it seriously. You’re laying the foundation to your future.