Most Helpful Guy
You're overthinking it, and oversharing. Just tell him you like him, but you're shy and you don't have much experience. He'll find you endearing.
Most Helpful Girl
Don't feel like a moron... just be honest, I find honesty is the best. Just start off as saying I have some I need to tell you about myself. Then just tell him about you have never been in a relationship and that he will be your first kiss. Please don't be ashamed I think it a great that you have been saving your self... be proud of it...