The way you know her to be, is who she is. Your concerns deserve to be addressed now in a good, honest talk with her. You both may decide to work on being healthier together and you can support her. Or she may be put off and not receptive of the idea. There are also concerns about reproduction, which may be something for you to consider if you want to have kids. These are important discussions and doing it sooner rather than later is best.

Her calling herself damaged goods is concerning. She is being very open with you about her feeling damaged. This will be something you will be dealing with in your marriage. She questions if you really want to marry her. I think it is good you are really working through all this before you get married. It is certain there will be these issues, because they are already there.