This brings back memories. It took us years of dashed hopes, repeated loss, IVF (privately) before our miracle baby.
Eventually just going to the stores to do the weekly shop was difficult because we'd see so many young families and newborns. We developed so many unhealthy coping mechanisms along the way. Seriously, some of the things we'd think would have got us killed in some cultures.
I think it's because if you're actively trying to conceive and it doesn't happen or you miscarry, it's all too easy to let it consume you, so you end up noticing all the babies and young families that you didn't really take much notice of before.
You have all my sympathies with this, it's extremely hard to cope with sometimes.
As an aside, about 3 weeks before I'm due to start my leave, my boss tells me they're going to be a parent for the first time in August having skipped the years of hell that my DH and I went through. Even though we got there in the end after so much misery, knowing that someone else not only got pregnant on the first try AND has already made it to the 2nd trimester with no problems is quite enraging.
Don't feel bad about venting and I can't stress this enough, you are NOT a bad person. You're going through a very difficult time that should be one of the most exciting times of your life. There are lots of couples who have gone through and/or are going through the same thing as you xx
Social media is such a cesspit for this. Can you take a break from it for a while? I recommend doing that for your own sanity.
Please never give up and I wish you all the best of the best xx