A person's interests and passions can change over time, so first of all, don't stress about this. The exploring will be fun! In addition to what Phillip mentions above, I would make a list of the activities and subjects you are even slightly interested in and try to understand why you like them. For example, if you like your Literature classes, is it because reading is enjoyable to you or because you like writing the assignments or you're good at presenting in front of your class? Or maybe you enjoyed reading a book about Science a lot more than a novel. What extra curricular activities do you enjoy? If you come with some of these in mind or some initial thoughts on them, the conversation with the counselor will be much more fruitful.