It will be very difficult to get her back because she thinks you lied about your age so as to seduce her or others. You can try but I don't think she will believe you about it. People don't like being taken advantage of or being lied to. Even if it was accidental, it is difficult for someone to believe you. I suggest you don't contact her for a few days. Afterward, contact her and try your best (in a calm voice to explain). If she still insists (or doesn't answer or reply to your text) she doesn't want anything to do with you, you will have to accept it's over.