"So I've wanted to ask you out for a while but I've always been afraid you would say no, would you like to prove me wrong?"

Thoughts?

Maye something also about how I've always thought you were pretty.

Don't ask. Tell her what your plans are and say she's welcome to join you.

If she declines then she knows you are out and having a good time without her and she's the one missing out. If you ask and she declines, she knows you're probably at home moping about being rejected.

My thoughts are that once you tell the girl you like her or youve been wanting to ask her out for a while you can no longer be considered a challenge.
Switch the playing field up. Make her come to you. Be flirty, push and pull, be cocky funny, make it so you are the prize, not her.
Maybe you catch her staring or looking at you say "why you staring at me like that" with a big smile. She'll say something like "idk what do you mean". Then say "I know what that stare means. Look, youre kind of cute but I only like rockstar girls" Be playful, turn the tables on her and before you know it she'll be naked in your bed lol

Problem is I never see her

I know this is frowned upon, but you should find out her scedule and occassionally "bump" into her. Don't let anyone know because it truly is creepy. If you can't then you need to improve your "online game". Online sarging is pretty helpful. Good luck!

Nope.... I think I'm going to let this one go. I think I lost my opportunity back when I had class with her and didn't make a move. Lesson learn. Don't wait too long or opportunity may pass.