I'm afraid I might lose her....?

I'm trying to become a better teenaged boy by following Jesus. My girlfriend says she is proud of me and she is with me all the way, she's trying too. But we aren't going to be able to do anything together, no more hugging, kissing, or cuddling because her parents don't approve of it. I'm scared that she may get fed up with not getting what she wants with me and it either result in cheating or leaving me. I'm really concerned about this.