How does self-concept affect behaviour?

Self concept can affect behaviour in so many ways such as: psychologically since it concerns thoughts and ideas about a person. This is usuaslly the point inwhich a person could contracdict his or her real self for another. E.g mr A seeing Mathematics as a difficult subject of study, which he could ordinnarily be able to do it perfectly if he had thought of it from a positive perspective. Instead he yielded to fear. From ETIEH KELVIN NWABU aka IMPECCABLE.