Starting to feel hopeless 😔

My husband and I have been trying for baby number 2 for 8 months.. 8 long months of NOTHING. And the worst part is everybody saying, "no baby yet?" and "when you gonna get pregnant?" I wish I knew the answer.. but I can assure you all the comments aren't helping. And I always say, "idk we just aren't having luck with fertility." Nobody understands how difficult it is to repeatedly fail EVERY MONTH. I have a 5 year, got pregnant with him my senior year of high school. My husband isn't his biological dad. Maybe he isn't fertile.. or maybe some how I'm not fertile anymore. Idk what to think. I'm just so discouraged.. it's destroying me. I'm not giving up. I can't give up.