Water based lubes are to be used with a latex product like condoms then oil is best.
Since you are orgasmic with masturbation and have self penetrated your vagina, "virgin" no longer applies.
Just have your birth control in place then feel free to use him for your first experiment with "going all the way."
Your lesson for today is that masturbation is REAL Sex!
Stay with masturbating to orgasms and forgive yourself.
My advice is to stay with manual masturbation in your teens.
Before you make yourself available to boys, I hope you know how to have an orgasm with yourself from masturbation.
If you've had an orgasm with yourself, you're not a virgin.
How about embracing the label "Slut" and simply become a good one.
Learn about your own body by exploring masturbation including vaginal penetration.