trust me its not a bad thing. ignore all the mean comments your going to get. she feels its wrong, but she doesn't understand obviously, how it feels. she's married to a man, or was at some time, so she thinks its wrong. don't change just to please people. :)
A lot of parents think that way at first. I live in San Francisco and when I talk to my gay friends 90% say that their mother's were very mean in the beginning, but they warmed up to it after a while. In the end, if she truly loves you she will be okay with you being who you are. If she doesn't, then she truly doesn't love you. There is nothing wrong with being gay. That is just who you are and you can't change that any more than someone can change their heritage or their skin color. Just be happy that the hardest part of being gay, telling your parents, is already done. Now, you have to let your mom get used to the idea. Eventually you will have to talk to her and tell her that being gay doesn't change who you are, if anything it changes how you view the world because now you feel more complete with yourself.