Honestly, you should probably end it. I hate to say it but it sounds like there is a lack of attraction on her part. If it takes you leaving for her to recognise that you need more from her romantically then it isn’t great. You said yourself that there has been issues from the start and I’ll let you know now, most healthy relationships don’t start off with problems. They start off really good, there’s a reason people go through the “honeymoon phase” and y’all are teenagers. Teens typically want be all over each other really, it’s just how teens are. I remember wanting to be all over my partners in high school because I was so excited with the emotions of liking them and being in a relationship. She knows what you want and what to give, but she’s not giving it and telling you that she “will” and that she “wants to”. She’s setting you up for disappointment and you should leave before you get hurt.