The Outsider (1951)

Sinopsis

Susan, a pretty high school student, has everything going for her—except popularity. She can't figure out why she is so "out of step" with the rest of the crowd. She finally comes to realize that her habit of "hanging back" and "not trying to fit in" is making her unpopular. She vows to change her ways and go along with the crowd, which means that people will like her.