How do I begin identifying my core values?

Start with the voice that appears after you assert a need. After you say no, ask for space, or refuse to absorb something. Notice whose verdict that voice is delivering. Is it yours, or is it a voice that was given to you early enough that it has learned to speak in your accent? That moment of examination, sitting with a specific situation and asking honestly whether the belief underneath it belongs to you, is where values work actually begins. Not with a list of aspirational qualities. With the truth of what you have been carrying, and the question of whether it is yours to keep.