Anyone who can help it would be greatly appreciated?

Need help on what to do about this girl?

She is in my creative writing class and she is the grade below me I've started developing feelings for her we had senior prom on saturday night and she went with a guy that I know but I know that they are only friends, She was absolutely beautiful she looked amazing but she always looks beautiful, I doubt she knows how I feel about her and I need advice cause I'm gonna be seeing her tomorrow in class and I'm not sure if I should tell her or wait and see if she wants to go out this weekend, any advice is appreciated

One thing I lack though is self confidence I am not exactly a small guy I do carry about a bit of weight and I doubt that I'm that great looking of a guy