Just One of the Girls (1993)

Chris is constantly pushed around by bully Kurt and his gang. When he must transfer to their school, he decides to disguise himself in girls' garb on the way to school to avoid his tormentors. But on the first morning he becomes bound to the role when he runs into two teachers while he's still in his female disguise. He learns of the advantages when he manages to become best (girl-)friend to cheerleader Marie. But when his coach sees how much he enjoys cleaning the women's showers, she becomes suspicious.