me =(

I find myself useless most of the time. I don't have the confident that others have. I don't think I can get things done myself. I always feel that people don't like to talk to me, don't like to hang out with me and don't need me in their life. I don't achieve good result, don't look good, not tall enough, not slim enough. All these really bring my level of confident to zero. Can anyone tell me what am I supposed to do to make me feel more confident???