Okay, so ever since my first lesson in college, she has been on my mind and her smile just melts me, but I'm unsure what to do

I, 16M, know a girl in my literature class who sits directly opposite to me, and ever since my first lesson ever in college, she was the first to catch my eye and I always look forward to seeing her, check up on her throughout lessons, find her smile just absolutely stunning, like my brain literally just takes pictures of her smile and sometimes I just look back on them in my head, and honestly I could go on and on about her.
The thing is though, that I'm sure if we have a strong kind of like connection yet, she sometimes gives me short/simple answers but I can tell she's genuine through her tone of voice and of course her smile. I can't message her online as she doesn't use her phone much for communication from what she's told me and last time we tried to meet up for lunch it kinda just didn't work
And I just kinda don't have any idea on what to do except for just wait until I can see her in lesson and occasionally give her a compliment, any ideas from any of you?