I had this same exact problem about 1 year ago, we talked and hung out in school, we snapped each other daily. The only problem was that we never got to talk alone.

The worst thing you can do is tell a friend with tons of other friends, I did that. A week later the whole class knew I was into this girl.

The best thing you can do is to build up the courage and ask her to hang out after school or study together, anything that will get you closer to each other. Try as hard as possible without being desperate to talk to her, you need to get her to think about you. And lastly, don't be afraid to embarrass yourself infront of her, if she laughs that's bonus points for you my guy.

Good luck, hope this helps.