[ Singles & Dating ] Open Question : How do i forget about a girl i REALLY REALLY like that has the same class as me?

i REALLY like this girl alot.. i love thinking bout her and seeing her in school. But i dont think she likes me back( as i am not that attractive). So can you guys give me advice and suggestions to forget about her and move on? or what can i do about this situation. we use to talk alot last year and i even thought that she liked me at some point. But i never had the guts to ask her out or anything( im shy).