What do I do?

So I’m in college and there’s this boy that I like and I really want to start speaking to him and stuff but he’s not in any of my classes and I don’t really ever have the option to talk to him because we don’t really have the same friends... and I don’t have the balls. I have his instagram and we both follow each other but I don’t have anything else however my friend sits near him in one of her classes. Any ideas on how to start speaking to him?