I didn't kiss my boy friend!?

We were walking downstairs and there was alot of teachers around. I didn't want to get PDA! But we were with his stepsister and my best friend. Well they were like kiss already and he was just standing there waiting for me to kiss him. I have wanted to kiss him for awhile and it will be my first kiss. ANd I just said," Lets just go downstairs and I will kiss you tommorrow... I mean Monday." And now I I really want to talk to him. I REALLY WANT TO KISS HIM AND I DIDNT! Why did I do that?? What should I do??