My story need to vent

So it's been hectic my niece and nephew both have a baby on the way both said they didn't want kids. Here I am wanting to have a baby and it just not happening everyone says don't give up hope how do people not give up hope after a year of trying. How do I be happy for them when I am dying inside I try and talk to my husband but he isn't any help. I just wish I had friends who understand me. I have no real friends my sister has tried to comfort me with saying she tried for 10 years, but I can't with my heart condition dr said within the 5 years would be best because my heart won't be able to handle it after that