Nervous..

When i first meet someone that I actually like I really want to talk to them. But I can never have anything to talk about! I always ask myself when I see other couples “i wonder what they talk about to keep each other interested and not be boring” I was always on the shy side but I have let go a little.. I’m more comfortable talking face to face and being playful etc but I still sometimes get nervous and tend to not talk or have anything to talk about.. what are some things that can keep a conversation going?