When should I kiss my girlfriend?

Ok so me and my girlfriend have been going out for over 2 months and i really want to kiss her. I am in 6th grade and she is in 8th.We have been talking about kissing and her friends have told me that she wants to kiss me too.We see each other in the morning,at lunch, and at the end of the day. We are mostly around people but we have some places where we can be alone.When and how should i kiss her? Thanks in advance.