How can i not get nervous?

My best guy friend/crush and i were talking and we started about first kisses and he has never kissed any1 they always kiss him so he asked me if i enjoyed mine and of course i said and then he said he has wanted to do this "action" and then he said he needed some where private he could do this action but he said not to tell his girlfriend and i promised not knowing what he was talking about so we started looking for some where private but contentment anywhere private because we were at after school care but we couldn't find anywhere to go but when we did my dad came and picked me up but he said he would do his action in the next morning is he talking about kissing because if he is he has a girl friend and i think he is thinking about kissing me and how do i feel less nervous about kissing him?