Gay in a family

First of all, I love my family. There is nothing in this world that can replace their positions. As I am the only son and raised in Asian family background. I would be expected to marry a wife, have babies and carry on the family name to the next generations. Considering I am gay, should I able to carry on this task? I can't imagine what my family will react when they know that I am gay. I still remember that my mom once told me if she had a son that was gay, she would go crazy. Mom, I really love you and I don't want anything happen to you, but I am the one that might cause you go insane. Will you still love me when you know the truth? To my Dad, he is the everything that keeps this family survive. He is strong. Anyway, something happened between him and I for the past few years and now we are getting better and better. I would expect that my Dad won't be so frustrated as my mom if he knew that I was gay. Because he always say he will be happy as long as I am happy so do my mom. Just I think my mom won't accept the fact easily. For my sister, I won't worry so much as she has already had her own family to worry about. So the only concerns is: should I act as a heterosexual just to keep my family knows that they have a straight boy in the house? Living in a denial is nothing but struggling.