Feeling lost

So I had a miscarriage over a year ago, and since then I've healed from the pain or so I thought... but recently I've had a few friends announce they are expecting, and one of the few isn't a very good person and idk if it's normal to feel like they don't deserve the blessing of a child... I've been trying to get pregnant for the last three months and nothing but late periods and negative tests. I don't like that I feel they don't deserve the shot a children, but I'm in the stage where I feel like nothings fair... what should I do?! I desperately need help, anything helps... I'm sorry it's anon but for reasons I don't want to be named.... thank you for your help