that is scary, I think your wife sounded pretty vague, maybe show her some resources together and more deeply discuss how the change is going to be, more accurately reask her how it makes her feel and see how time will tell.
Your wife has every right to back away if this doesnt make her comfortable, it hapoens sometimes unfortunately. Hopefully she can be respectful about the entire thing. Best case scenario she will love you for who you are and come to terms with what this means for you.
Your daughter might be a little different, if she is younger you can definitely teach her what's going on in your life. If they are older they might have biases, confusions, and fears, but it doesnt hurt to have a heart to heart either way.
Just remember, living for others can only take you so far, it is NOT a bad thing to think about yourself, help yourself, be yourself. I know people who hate themselves so much and only find worth in others, and their life is miserable and I've always found that behavior to be very unhealthy.