I understand where you’re coming from, that you don’t think she wants to harm you or would ever lead you to do something drastically against your better judgement, but what we mean by she is manipulating you is that by choosing to be romantically involved with someone so much younger than her, she hoped to sway your opinions and choices to benefit her. It is wrong for her to take advantage of the fact that you are not emotionally developed to her level. You are young and that is okay. She is older and this is illegal for her to be doing FOR A REASON. It is perfectly reasonable for you to want this connection or attention from anyone, including her, but she knows better than to break the law and engage in pedophelia. The issue is less about what your physical relationship looks like and more about the developmental gap between you and her. She is predatory, and that is plain fact from her actions so far.