According to the symptoms you report (“don’t want sex ever”), you might be experiencing frigidity. Frigidity can’t be caused by contraceptive shots (depo provera). In fact, hormonal contraception can increase the libido because a woman can feel safe from an unwanted pregnancy, and therefore less anxious in general. You can visit your gynecologist and even a mental health professional (psychologist, sexologist, psychiatrist) for a consultation about your symptoms.