I have a crush on my LDS missionary!?

I was born into the church so I'm not a convert or an investigator. So the missionaries are ALWAYS at our house. They come over once a week to visit. We can talk to them for hours about anything! They're normally late getting back to their apartment :/ haha. Anyways, one of them is super cute and pays a lot of attention to me. Everyone has picked up that he has a crush on me. So what do I do?! :) I'm 18 and he is 19 by the way...