How do stay positive n hopeful ?!?!

How do y'all stay positive and hopeful when tryin to conciebe for years with no luck?!?! And literally everyone u know is posting pics of theirs positive test n Bellys and newborns. Seriously gettin so depressed! My hubbys  best frien just had their second baby 3 days ago n not ganna lie, I'm  not even happy for them I'm just jealous and bitter and so frustrated and sad!!! Hubs says I should be happy for them but I just can't. I feel like it's just never Gana happen 😭