Will it ever be the same again?

Just a few days ago I have kissed with a very good friend of mine. We both felt more for each other then just being friends, and it was just a matter of time till we would kiss. On Monday I saw him again at school and we both weren’t quite sure what to do, but we talked and we agreed that we had to behave normal again. But now it’s Wednesday and we are behaving so polite. It’s killing me! Normally we would talk during class and make fun, but now were quiet. I noticed that he watches carefully what he will say or do (to me), and that hurts. But ofcourse it is not only his fault, I’m also not responding to his jokes or talking to him when it’s not really necessary. I know I have to behave normal, but I can’t. It hurts to much. But now I don’t know what to do. Do I have to talk to him, about my true feelings? Do I just have to wait and maybe it will get better? Or do I have, no matter how much it hurts, behave normal and be strong? Please help, because I don’t know! I’m already crying for four days and I can’t sleep, because I am thinking of what to do. I never had a problem with love before, but now I know where all that people are talking about…