Yeah, I get it, I'm also a teenager. It feels to me like kids here grow up too early in comparison to other places I've visited such as the US. It's really hard to get into a true relationship over here imo.
My biggest advice would probably be: show something you're good/passionate at/about. Be it arts, sports, or just anything really, show what makes you different from all the others, and be considerate and respectful of her.
Additionally, from my personal experience in Italy, etiquette and culture is held in very high regards so it's good to know some of it.
Idk if this helped but I hope you find what you're looking for.