Hanazakari no Kimitachi e. The main character is pathetic, though. She's one of those characters who has no self respect and drools over the male MC the whole time.
If you're ever looking for a novel, I recommend Seven Daughters For Seven Sons. It's a perfect example of this and wonderfully written. I know you're not looking for a novel, but if you ever get bored, lol.
Thank you! I'll take a look at that novel
Ouran also works, but the guy in that situation who ends up thinking he's gay isn't the lead.
U can check this out
http://www.mangago.me/home/mangalist/58064/
Is there a manga that a girl dresses up as a guy and another guy fells in love with her and the guy thinks he is gay, like in kdramas