Spend more time hanging out in a group that includes both guys and girls. Worry less about trying to pair off with somebody right away.
They’re as scared of you as you are of them. Be honest, be sincere, be who you are. If the other person can’t handle that, move on.
Make female friends. As weird as it sounds, and for lack of a better term it humanizes them and makes it much easier to talk to and be confident around.