How would you feel if someone you knoe for a long time just opens up to you that he is an FTM transgender?

So, I am an ftm transgender and I used to lve with this elderly couple that didn't know tht I am an ftm. They thought I was a real bio male. It has been a year tll I open up to them about my condition tht I am actually a bio female, but I don't feel like I am lying to them because I really feel like a man and I told them that I don't think they wll understand me because it is not common. (Especially them) keep in mind that I spoke to them on the phone. So they hung up and the rest is history. So in your point of view, how would you feel if you were them? What is in your mind? What are you thinking when I said it? Do you feel lie to? Do you think I am crazy? Any bad response are welcome.