How to respond to everyone getting pregnant

I really struggle with this... we’ve been trying for 3 years now and nothing. I am happy for people that get pregnant etc , but it kills me at the same time .... I can’t help but get home and cry my eyes out. We want a little one so badly. Every month it’s just agonizing to get my cycle ...again. I just don’t know how to handle the disappointment anymore .... how do you keep looking forward to something that’s just not there ? What do you do different ? I’ve been driving myself crazy with diets and supplements ..... I need a sane middle ground .

So the question is ... to all those trying ... how do you handle the disappointments?