when family makes you feel like you are not a woman

years ago, i had a feeling something was wrong, my then BF and i never tried not to concieve, it just never happened.a few years go by and still nothing. So i thought, family, especially sisters, are supposed to be who you can turn too. BOY WAS I WRONG. (probably why i keep everything to myself now) I asked my sister if she would consider being a surrogate for me. she didn't even waste a breath before she said "No" fast forward about 5 months and I get a phone call, she is pregnant.... again... I can not even explain how i felt at that moment. i told her I was happy for her, hung up, and laid in my bed for days crying like a baby. since then she has never wasted an opportunity to make me feel like i am less of a woman than her because she has 4 and I can't even have 1.