Perhaps there's a genetic experiment that accidentally turns a straight male teen into a girl. His family has a hard time accepting the change at first. But as time passes, they see that he's still the same person on the inside. He then embarks on a journey to find a way to reverse the change while also learning a lot about himself and the concept of gender along the way.
The teen could be cursed by an ancient artifact. After accidentally activating it, he is transformed into a girl. He then travels to different parts of the world to find the origin of the artifact and a way to reverse the curse. Along the journey, he meets other cursed individuals and they form a group to help each other.
One idea could be that a mischievous fairy, in a magical forest, mistakes the straight male teen for someone else and with a wave of her wand, turns him into a girl. He then has to go on a quest to find the fairy to reverse the spell. Along the way, he experiences the world from a different perspective, making new friends who help him in his journey.
Another story could be that in a parallel universe, straight male teens are randomly made into girls as part of a cultural rite of passage. Our teen protagonist has to come to terms with his new body and identity while also trying to maintain his old relationships, which become more complicated as he is now a girl.
A plot could be that the teen girl has been training in a secret art form, like an ancient form of combat. When a man, perhaps a villain in the story, underestimates her because of her age and gender, she surprises him with her skills and overpowers him in a fight.
A teen who loves music suddenly loses their hearing. They then have to find a new way to connect with the music they love. It could involve them learning sign language and discovering a whole new community of deaf musicians. This plot is about self - discovery and not letting a setback stop you from following your passion.
A teen is transported to a parallel world where everything is a bit off - kilter. In this world, they are considered a hero by some and a threat by others. They have to find a way to get back home while also trying to fix the problems in this strange new world, which includes befriending some unlikely allies and facing powerful enemies.
One possible plot is that the girl was murdered and her ghost seeks revenge. She might haunt the killer or the place where she was killed.
Maybe the girl made up a story where she was in a dream and an old wise woman gave her the idea of having dreadlocks. The woman said that the dreadlocks would be a sign of her inner strength. So when she woke up, she decided to start making her hair into dreadlocks. Another plot could be that she made up a story about traveling to a far - off land where everyone had dreadlocks and she was given a special set of dreadlocks as a mark of honor in that land.
It could also be due to past experiences with men that were not positive. If she had bad relationships or experiences with men that made her feel unfulfilled or unhappy, she might be more open to exploring relationships with women. Also, some psychological research suggests that there may be some inborn factors that could play a role, but it's still a complex area of study.
The straight girl may feel extremely confused. She might start doubting her own sexuality or feel pressured into something she's not comfortable with.