How can I tell a girl in my class I have a crush on her?

How old are you?

Hello Aph,

Based on your description I'm assuming that you are in either middle school or high school. At this point you should just be honest with her. If it is meant to be it will be reciprocated. If not you will find another person you develop feelings for. Goodluck, and keep us updated!

-fdsaqwerish

You can treat her for a lunch. Then creat an chance to...

Just tell her! Be honest. If she likes you too, then she might tell you. The worst she can do is to say "leave me alone" or something similar. Good luck.

Your age would kind of help.