Nakagapos na puso (1986)

Sharon Cuneta stars as Elaine Fajardo, a young woman who has lived her entire life in the shadow of her sister Elisa Fajardo (Lorna Tolentino), who is not only older but more assertive, more intelligent, and more appreciated. She knows that even with her best effort she cannot compete with her. Everything is fine with her; she is, after all, more at peace with her kind of uncomplicated existence. But even the most submissive and patient person can only take so much. The day comes when she realizes that for her to live her own life she must end her meekness and learn to speak up.