This dream may be reflecting feelings of being overwhelmed and pressured by family expectations. The store represents a place of choices and decisions, and the presence of your parents may symbolize their influence and guidance in your life. The argument with your mother may represent a conflict between your own desires and the expectations placed upon you by your family. Your decision to leave the store and walk home upset may symbolize a desire to escape from these pressures. However, your family’s return and your mother’s outburst may suggest that these expectations and conflicts cannot be avoided. Your emotional distress and self-harm in the dream may represent the toll that these expectations are taking on you. The idea of running away may symbolize a desire to break free from these pressures and expectations. Your sister’s appearance to comfort you may represent a supportive and understanding aspect of yourself. Overall, this dream may be highlighting the need to address and communicate your feelings about family expectations and find a balance between your own desires and those of your family.