You are so beautiful.
You are so beautiful and funny and sweet and talented and intelligent and full of laughter + life.
Who you are is the most amazing gift you have.
So don't you dare. don't. you. dare. let some boy determine your worth. Don't let him make you feel inadequate or that you have to go "so far" to get his attention, keep his interest, or even prove that you are mature and old enough.
Don't go for a boy who's looking for experience, or hoping to fulfill some need. Don't go for someone who doesn't see anything wrong with expressing yourself sexually or believes that it's a "part of growing up."
You deserve so much better than that. Wait for someone who will love you and be attracted to you because of your 'mind,' because your personality and quirks. Who will first love you for the way you laugh, not because of the way your hips look in that dress or because of how enjoyable making out is. If he wants to see how "far" you're willing to let him go, he is the wrong guy.
You are SO much more than a body. You are human being - a woman. A woman of God, who should be respected and admired.
Don't go for a boy who simply finds you attractive and wants to date you; go for a man who will honor you, look on you with regard, and consider you a treasure that he wants to protect and defend.
So wait for a man who truly believes that.