If you really like this guy and he leans in make sure your first kiss is romantic not just willie nilly walk out of the house make out. Maybe on a date when a romantic or scary part comes on snuggle up to him and lean in closer and closer and then plant one down on him quickly before he can ruin the moment.
Just go with it if it feels right. I remember my first kiss. I was so nervous but I got use to it after a minute. If you don't really know how to kiss a boy, practice on your hand. just a little kiss is great.