I remember seeing this movie about 18 years ago on italian television. In the last years I've been looking for it, without luck.
It's a teen love story. The movie is german, french, or north european.
The main characters are a red head teen girl with curly hair and glasses, who falls in love with a tall, slightly older teen boy with long dark hair.
She has a girl friend with dark hair.
Her father is baldish and has a red old convertible sport car.
The boy who she falls in love with is in his last high school year and has a black van like the volkswagen model t2 which belonged to his grandfather and when he finishes school he intends to travel with it.
If I recall it right, there is a barn love scene and a cheating scene as well.
Every detail may be inexact, because so much time has passed.