In the closet CF.

My background: I came from a quite traditional Muslim South East Asia community and I have not met anybody who are CF. People are very child-centric here. Most of women my age are now married and have children. In other word, I'll never find another CF friend around and thus, nobody to talk to about being CF. I've been thinking about this for 3 years now and this year I finally decided that I am not going to have children. I haven't told my family about my decision yet. I told some of my friends and out of 4 of them only 2 are truly being supportive and accepting my lifestyle. I can predict what my parents' reaction especially my mother. I am almost sure of it. How do I break the news to her gently, without making our bad relationship worse?