I’ve never been particularly interested in or impressed by most teen romances, but I whole heartedly endorse the manga/anima suggestions. (For…reasons) Most shoujo would be a good choice. There’s some good shounen but much of it tends to be American Pie type sex comedies but with more fan service.
I particularly liked Kimi ni Todoke (Reaching You), Kimi no Iru Machi (The Town Where You Live) a more dramatic shounen/crossover manga. One of my favorites though the anime adaptation is not paricularly good, Last Game (!) Say I Love You (also has a live action movie), Wolf Girl and the Black Prince (another great one and not at all what it sounds like. It’s not a fantasy. I think it may also have a live action adaptation), Nana (a classic and significant manga/anime/movie. It’s Josei so it’s more mature --in the serious grown-up sense–following two teen girls named Nanna from high school graduation to early adulthood.)
You can actually find a number of these on YouTube as well as other sites. If you’re particularly interested in any, let me know and I can give you more information about them.