One's own voice is one of the most frequently heard voices. Studies found that hearing and talking to oneself have positive psychological effects. However, the design and implementation of self-voice for emotional regulation in HCI have yet to be explored. In this paper, we introduce InnerSelf, an innovative voice system based on speech synthesis technologies and the Large Language Model. It allows users to engage in supportive and empathic dialogue with their deepfake voice. By manipulating positive self-talk, our system aims to promote self-disclosure and regulation, reshaping negative thoughts and improving emotional well-being.