Misslips

Orange
Shirayuki hime (I think that’s it’s japanese name(?) but just in case in English it’s called Snow White with red hair, also has an anime too)

Check them out. They're all good. Some of them are written by yaoi mangaka:
http://www.mangago.me/home/mangalist/259455/

skip beat (its damn long)
heroine shikkaku (damn funny, although heroine might be annoying to some people )
hirunaka no ryuusei (heroine is bland)
kare kano
fruits basket (however it has many boys, not all of them are in love in her though)
i know more, but unfortunately annoying main heroine is like constant element in shoujo manga ;_;

I happen to be allergic to annoying female leads in shoujo. So, hope something from this little collection of mine might get your attention - http://www.mangago.me/home/mangalist/53203/

Kimi ni todoke
Living no Matsunaga-san (bless the art)
Sumika Sumire
Takane to Hana
Short cake cake

I was a shoujo fan until years ago so I cant really rmb some of the mangas that I loved lmao

http://www.mangago.me/read-manga/warau_kanoko_sama/
http://www.mangago.me/read-manga/koi_dano_ai_dano/

my favorite :D

also these
http://www.mangago.me/read-manga/oresama_teacher/
http://www.mangago.me/read-manga/dengeki_daisy/
http://www.mangago.me/read-manga/it_s_difficult_to_love_an_otaku/

and if you're looking for something more cliche
http://www.mangago.me/read-manga/hibi_chouchou/

also these
http://www.mangago.me/read-manga/oresama_teacher/
http://www.mangago.me/read-manga/dengeki_daisy/
http://www.mangago.me/read-manga/it_s_difficult_to_love_an_otaku/

and if you're looking for something more cliche
http://www.mangago.me/read-manga/hibi_chouchou/

Akatsuki no Yona: http://www.mangago.me/read-manga/akatsuki_no_yona/ (ANIME)
Qishi Huanxiang Ye: http://www.mangago.me/read-manga/qishi_huanxiang_ye/
Namaikizakari: http://www.mangago.me/read-manga/namaikizakari/
Dengeki Daisy: http://www.mangago.me/read-manga/dengeki_daisy/
Kanata Kara: http://www.mangago.me/read-manga/kanata_kara/
Hirunaka No Ryuusei: http://www.mangago.me/read-manga/hirunaka_no_ryuusei/
Akagami no Shirayukihime: http://www.mangago.me/read-manga/akagami_no_shirayukihime/ (ANIME)
ReRe Hello: http://www.mangago.me/read-manga/rere_hello/

These are the first that came to my mind, and they are quite interesting and good. Hope you like it.

Hirunaka no Ryuusei, Kyou no Kira-kun, Perfect World (this one is josei tho)

Some of them I've already read but thank you.

Enen no Shouboutai?

http://www.mangago.me/read-manga/enen_no_shouboutai/

Thank yoy