Am I a horrible person

So I just recently found out my little brother is having a baby. I'm excited to have a niece or nephew, but I'm really not happy for him. He's been out of jail for about a year and got some girl he's dating pregnant. My cousin just had a baby today with his ex while his current girlfriend is pregnant and due in a few months. He also just got out of prison barely a year ago. All I can feel is jealousy and anger. My husband and I have been trying for over two years and I have a blocked tube and scarring on my uterus. We have our shit together, my husband just got out of the army and now we work, go to school, just bought a house and have friends and family keep asking when we are having a baby and why we haven't yet. I don't know how to respond to that question, especially since I hate that question. I feel embarrassed and broken. And now I feel like a horrible person for not being genuinely happy for my family, but envious instead. Is it normal to feel this way, is it ok?