Why did my foster mother do this to me?

From your description, you were adopted and they should have their own children, so you experienced a lot of injustice and abuse when you were a child. However, in my analysis, all your disappointments are ultimately caused by your own self-love. You said you were broken by an outsider. In general, as an adult woman, you lead an honest and clean life and don't make some friends. Why would anyone do that? So if you want to change the status quo, first of all, you should cherish yourself, take your feelings seriously, and know how to stay in shape before meeting your true lover, that is, you are no longer a virgin, which will also enhance your value. Third, after you get well, you can find a job and stick to it. This is not only insisting on supporting yourself, but also waiting for your future. There are so many men in the world that you will always meet people who are kind to you. Finally, you put aside resentment, stay away from them and find your own happiness. In the meantime, you also call them from time to time to send some money. After all, you raised you, and you are grateful and optimistic to make yourself more attractive.