I believe depression can come from a crisis of identity. Every human being has the free will to believe as they choose and be whom they choose. If I am chronically anxious and/or depressed it may be thay my beliefs and identity are not serving me well. Medication should only be used as a last resort. Learning good coping skills will go a long way. Answering the question "who am I" correctly may be the biggest discovery of one's life.