GD Help me real quick, school starts in like an hour! Need advice!

Ok so today I'm going to tell the girl I like that I like her, I've known her for like 2 years now, she was in one of my classes last year and she is in my French/Eng class this year ( 3rd and 4th period) Today we have the final for our third and fourth period, so both that classes I have with her. I remember her mentioning something about how she's not interested in relationships rn ( just in general, I wasn't asking her out or anything) So how should I tell her I like her? I'm sitting at my computer with my blue collared shirt on, some khaki shorts, typing this and putting some last minute study for my English final at the same time. She's really smart, funny, nice, and HOT. ( like god dayum, hola mama citaaaa) xD pls help school starts in an hour, how should I tell her I like her? All you basement Romeos out there pls halp ^^

Edit : omg so i was so nervous, i ran up to her and told her i liked her and i was so nervous/my voice was stuttering but we hugged and stuff ^^ gg wp