What should I do when I find out my boyfriend is going to kiss my in 3 days?

My boyfriend's best friend is also mine, and the friend told me my boyfriend is planning to kiss me in three days, the last day of school(he's not known for his awesomely incredible secret-keeping skills XD). He's had lots of girlfriends in the past, and I've never had a boyfriend in my life past him(That should be natural for 6th grade, right?). Which means he's an experienced kisser. And I'm not. Any advise? I hate drama, at least summer's coming soon and I'll escape, cuz my nerves are going crazy. Can anyone help with this? I've checking the internet, but in all of the examples they give, either both of them are used to kissing or both of them aren't, and that's not my case. I'm babbling again, aren't I? (d*mn my nerves and noob-ishness) I'm thinking of hiding for lunch, recess, and going straight home after school to avoid making a fool of myself. Am I overreacting? And is 6th grade a normal time to get your first kiss?