Mom can't accept that I'm never having children

My mom has been pressuring me to have kids for years. I have since I was 8 said I don't want children. I like kids but maybe I'm just selfish but I don't want to wake up and change diapers. I like being able to do what I want when I want. I like quiet. I am 43 and now going through peri menopause. My mom is upset because my clock is "running out". I haven't had a period in 4 months. I am married and I am a step mom. My step son was 16 when me and my husband were dating, 17 when we got married. My mom started using that as a reason for me to have kids because I'm already step mom and I said being a step mom to a 17 year old is different from having a baby. My mom is told me today if me and my husband divorced tomorrow no man will want my withered vagina and uterus and I won't have kids to be there and get me through it so I'll spend the nex 40-50 years alone. Who says that to their daughter?!