http://www.mangago.me/read-manga/glass_mask/ You need to read this!! It won't disappoint you. I promise. The anime's also really good :D
this one isnt about acting but i think it has a similar feel
its about modeling and fashion
http://www.mangago.me/read-manga/the_one/
http://www.mangago.me/read-manga/w_juliet/
This is about acting, but it fits to the Psychological genre rather than shoujo:
http://www.mangago.me/read-manga/kasane/
Can anyone recommend me some manga where the main character is really good at acting? I just finished Skip Beat and I'm looking for something similar. Thank you guys so much. (≧∀≦)