Feeling like a failure:(

Ok so my husband and I have been together for 8 years married for 2.5 been trying to convince for about a year now since my heart dr cleared me to have kids . But honesty I don't think it's going to happen . I have both polycystic ovarian syndrome and polycystic kidneys. I honesty feel like a failure . Everyone around me is having children including my little sister who has 3 . Everyone says I would be an amazing mother and its some thing I want so bad