How to start conversation with younger cousin?

So i (20m) got a younger cousin (14f) and i dont really know what to talk with her about. Im kind of introverted and so is she so it gets pretty awkward. She seems like any average teenage girl and i was kind of weird and an outsider when i was 14 so i dont really know what to talk about. Any tips on how to start a conversation with her and keep it going? thanks