Why is everything so hard

My sister everything comes easy for her and as for me things are always difficult. Today at Christmas she gave my parents gifts to tell them that they were going to be grandparents (first grandchild on the way) as soon as I heard I bury into tears and ran away bawling. All I did today was cry because my husband and I have been trying for over a year and found out two months ago I have PCOS. My sister and her husband tried for two months and got pregnant. Ive never felt so devastated and like it will never happen for me.

I honestly feel I won’t ever be able to have children. Help!