So, I've finally switched my major to a Physics B.S. I am a 2nd year, sophomore, previously Chem. Eng.. I didn't switch after the start of the semester so I am missing out on some physics classes, but am planning to make those up later, and have went through a few of those classes' textbooks, and did tests for each chapter. I've done intro to Quantum using Griffiths 1st edition, Fluids, and Thermo. through textbooks. I am only mentioning this to give an idea of what experience I've have with physics classes. Anyway, my main question is now, how do I go about choosing the field I want to go into once I do my PhD. From all the physics I've done so far, I love all of it. My main issue now is choosing between subjects, but I can't imagine myself doing that. I would like to learn everything, but I know that is not realistic. How can I possibly make up my mind, or at least even some tips on deciding what I would want to do?