I have a crush!!

Okay so this guy Andrew is in my Astronomy and English class and I think he’s super cute and he’s literally the sweetest guy ever oh and he’s also my lab partner!! Anyway whenever we have a lab and there’s only one chair he tells me to sit and he stands and after we finish we just sit and talk about what we’re gonna do after we graduate and turns out we wanna go to the same college😩 I really want to talk to him more and get to know him better but I don’t know what do do ): i wanna ask for his Snapchat or his number but I don’t want to sound desperate and idk if he has a gf or anything and he’s probably not even interested but I also have never had a boyfriend before 🤕 I need help.