Act exactly like him. He will know how you feel. Stand as close as you can to him as he will allow. Do not make eye contact. And when you talk to him, talk really soft so he cannot quite tell what you said, this will force him to interact with you, even if it's only "what"? Be sure to smile a lot, he is probably picking up on visuals. Hope some of this helps, I suffered from chronic shyness well into adulthood. But now...damn...enough already.