I really like this girl. I didn't know her much last year, and we started to talk this year in msn. We talked about everything, soon we became best friends. She tells me everything. I tried to ask her out as her friend, but she keeps saying go with more people. I am really confused. Now, we don't talk that much, she's getting closer with other boys in her class (I am not in her class). We don't have many topic to talk about in msn now, I am really scared of losing her. I want to change my classes, but I just cant. If one day I ask her out as a real date, and if she says no, I will lose her. Now we are just bestfriends. I want her to know I love her. I told her that I love her (kind of joking mode), she said, "no, you don't love me"... what should I do? Also, she's leaving this year... to other country...

Figure what it is you love about her and find it in someone else.
What good is it going to do you if you love someone that has to leave anyway?

A healthy dose of reality goes a long way. She is a good friend. If you pressure her you risk losing her friendship. AND she's moving away soon.

Everything in your story says "stop pressuring her for romance" and you're not listening to yourself. Listen better. Just because you want it doesn't make it smart or beneficial to you OR her.

Enjoy your friend as a friend the best you can until she moves away. In the meantime, you should keep your eyes alert for dating opportunities that CAN lead to something.