Be interested in him, focus on finding out who he is, what he's like, what he does with his life (inner life and outer life), what his stories are. If you focus on those kinds of things, you won't be focused on less useful stuff like 'what does he think of me.'
Then try to have fun! I assume you're going to do something that you're both interested in, like dinner, or some activity? That gives you many things to turn your focus on, rather than your nervousness.