So would you let this go, or give it a shot?

I recently began to like this girl in one of my classes, it wasnt too long that i began to talk to her, and it was the day of the final just friday, and i was going to ask her for her number, but she showed up late to the final and she finished before i did and she left, without me ever asking her for her number. I would most likely not see her until the fall semester or if we are lucky to even get a class together. She doesn't have any type of social media *which is great!*. I then realize i can send her an email through the school that we go to, a university. i can just look her up and her email is there!

But for one, it seems weird, especially if we havent talked all that much, but i would like to get to know her. Though yesterday when i missed my chance, i thought i shouldn't be sad, i should move on and enjoy life! But today i thought about doing that! but i'm like "I should do it, take the chance! you won't get anything accomplished sitting there and doing nothing" but also "there are some things in life that's best to move on from".

So what do you guys think?