Tomi is right. It's something that is built into us. Although I did once kiss a man that thought he was a Hoover vaccume cleaner. Don't do that!
The first boy that kissed me good night at 15 got the door slammed in his face and told to never do that again. So, the next week I started seeing a new boy and I discovered that kissing is way fun!
You will be great, just relax and have fun.