I need help with my style?

I don't really have a style. I wear a t-shirt and Nike shorts all the time but then I'll wear a few cute clothes here and there, but they aren't a certain kind. I'll wear ruffles one day, then a leather jacket the next. I want to dress more preppy next year but I have no idea what to wear. I'm 5'3, I have brown hair, freckles, green eyes, and I'm athletic so I have big thighs. Please help!