do somebody know a shoujo manga with many chapters?

Not sure how many chapters is "a lot" but here's a list with manga containing 10+ chapters:
http://www.mangago.zone/home/mangalist/3276/

Sorry if it's not what you're looking for ;;

Skip Beat (220~ + chapters)
Tokyo Crazy Paradise (same author as above, 110 chapters. Kinda intense o.o)
Seiyuu Ka~ (~60 chapters)
Hana to Akuma (58 chapters)
Love so Life (~90+ chapters)
Special A (90 chapters)
Kitchen no Ohimesama (47 chapters)
Ultra Maniac (25 chapters)
My personal recommendations. Sorry I can't provide you with links (〜￣△￣)〜 but they're all on this website :)