What to say to my crush??

I have the biggest crush on this guy in my English. Every week we have to get into these groups and he happens to be in my group. But, I’ve never said anything to him really bc I get so nervous and I kinda shut down. He’s super popular and hangs out w all the popular girls so I’m scared to ask for his snap because even though he seems super nice and genuine, I don’t want the popular girls to know if he doesn’t like me. So anyways, I wanna try talking to him next time we’re in the groups. What should I say? I have no idea how to start a convo.