Am I (adopted) a problem?

Candice
So a few weeks ago my boyfriends mom and I went for a walk and the conversation of children got brought up. I told her that her son and I have talked about adopting. I am adopted. I have been through a lot of things in my life but I didn't ask for them and nor do I expect sympathy about it. She later told my boyfriend (her son) that "adopted children are a problem you don't want". You have no idea how much that hurt my feelings. I don't want to think my parents look at me as a burden. So now I sit and ask myself if I should say something to her or if I should let it go bc I'm not suppose to know anyways and I don't want my boyfriend to feel uncomfortable. What do you think I should do?